[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
Sorry Kai - I got swamped by real-life issues. I finally got the time to look into this a few days ago, and when I went to check on it then in case a kernel update had fixed things already, it looks like it has (or at least, mostly so) - peaks are back to 80+, so that's within wifi variance again. It did show a strange very severe falloff in a couple of tests - down to 40-ish for several seconds during large file transfer, which is new. But I haven't been able to repeat that anything like enough to be able to test versions against it. I'm set up to DO that testing if I can find a good way to repro that, or for the next time performance goes in the tank. For now though, this is going to have to sit in the "I'll keep an eye on it, but can't do anything right now" pile. Thanks again for all your help. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
Thanks Kai. Yes, I really want to use Ubuntu kernel to bisect: or at least, I need the option to be able to - because if the problem is coming from the Ubuntu patchset, I could spend weeks bisecting mainline and never find it, whereas if I bisect the Ubuntu tree I'm guaranteed to find it and that one can be mapped back to mainline if needed, whereas we can't go the other way around. The other critical aspect to having the Ubuntu tree available is that it gives me the Ubuntu 5.0.0-23 build as a sanity check, it case the problem is being caused elsewhere. Remember, this is *wifi* we're talking about: any number of pieces could be to blame, from a power outage resetting something in the router (20/40 coexistence, for example) to physical antennas in multiple devices, and so on. I need a way to validate beyond question that it IS the kernel that's at fault before I go any further with this to avoid risking wasting everybody's time, including yours. :) Anyway, now that I have that info I'll free up a Passport and get things underway. Thanks again. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
Had the affected machine in here (i.e. "where the router is") for other reasons, so I was able to check those conditions too. As expected, it's a power / antenna / etc issue: Linux 5.3.0-19-generic #20-Ubuntu SMP Fri Oct 18 09:04:39 UTC 2019 x86_64 Fri 08-Nov-19 03:29 sent 459,277,171 bytes received 35 bytes 7,467,922.05 bytes/sec iwlist scan, WHILE the rsync was running (so it shouldn't be power-saving at all) with the router 6' away with clear LOS showed: Frequency:2.422 GHz (Channel 3) Quality=62/70 Signal level=-48 dBm Looking at 1795116, I used to get 70/70 at -32 dBm upstairs and through half a dozen walls, so obviously this is a significant drop in link quality given the hugely better conditions. Compared to 4.15.0-36 - which, bear in mind was one of the BROKEN kernels, the performance is 7,467,922 / 11,167,414, or 66.9% of what it should be in that scenario. The good news is, that difference suggests it's at least not a simple merge regression of 1795116. The bad news is, of course, that it'll need a new round of investigation track down. As I've said, I'm willing to set things up to help out, but I'm still waiting for you to provide me with the ACTUAL Ubuntu kernel tree to bisect against. In the meantime, I'll probaby try a couple of the mainline builds since I can just dpkg those, but with no way to map the working Ubuntu ones to the mainline tree I'll never have a baseline to compare against in case something stupid has happened like one of the antenna connectors has become disconnected or etc. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
Okay - the 18.04.3 release I tested in September, which was fine, has 5.0.0-23. -29 is broken, as mentioned above. That's a pretty narrow window to work with. I'd prefer it if someone from Canonical took it from here. (Heck, there are probably few enough commits to that driver in that timeframe that I could find the bad one more easily just by browsing the source than getting that machine to build it). Since it's the HWE stack that's broken, I could still install 18.04 from the image I have and switch back to the original Bionic kernel series, though it's anybody's guess if the same regression was merged into 4.15 again as well. Having to do a fresh install sucks pretty hard, but I'd at least be able to pin the last unbroken kernel, whereas on 19.10 there aren't any working ones in the repos at all (AFAIK) so I'm basically screwed until a fix makes its way through the system or I brute-force an older one onto it. I'm still trying to decide if I really want to go down that road or not. I found https://people.canonical.com/~kernel/info/kernel-version-map.html , but it's basically useless. All the 4.15 kernels from the working -32 through the 7 months of buggy ones and out the other side to -55 when it was fixed are all just "4.15.18 mainline". Maybe I'm missing something here, but without the tree that you guys are *actually building from* I don't see how me bisecting mainline is going to achieve anything. If that page is accurate it has nothing to do with mainline at all and the bug only exists in the Ubuntu tree in the first place, neh? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
16.04.6 turned out to have 4.15.0-45, which is one of the known-broken releases. Unsurprisingly, it delivered the same poor results as 5.3. I'm running low on sensible options here. I no longer have the bootable 18.04 stick I used before, but I can create a new one easily enough (as long as I remember to use the .0 image and avoid the HWE stack). But it's not going to tell us anything we don't already know, and it's no use for either normal use or testing. I could wipe the machine and install 18.04, which would cost me years of customisation and bugfixing. Since the bug is in the HWE kernels it would also be possible to test those separately, though it would need a lot of messing around each time. This is sort-of tempting for other reasons anyway, but it'll take weeks of elapsed time to get everything repaired, which is time I won't be able to spend on this bug. I can't really repartition it while doing that, unfortunately. It just has a very small SSD to boot off, and is heavily dependent on the LAN. I could probably JUST about carve out another very small partition to put 18.04 on, which would make the backwards-migration easier and leave me able to validate a fix for this at some point, but it's already seriously hurting for space at times. I'll give it some thought. In the meantime, do you have a preference or any suggestions that might influence that decision? Returning to your original bisection request: since Ubuntu generates its own kernels, if you can give me the mapping from the not-broken 4.15.0-55 to the equivalent starting point in Linus's tree, and likewise for the broken 5.0.0-29, I'll see about sacrificing a USB HDD to that machine for a while for it to build on. No promises, and it'll still take weeks to actually complete, but I'll do what I can. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
Any specific params you want for iperf BTW? I ran some basic tests against a VM after all: it might have lost a few %, but wireless is so slow that it's not going to make any meaningful difference. [ ID] IntervalTransferBandwidth Reads Dist(bin=16.0K) [ 4] 0.-11.4354 sec 45.8 MBytes 33.6 Mbits/sec 22348 22341:6:0:1:0:0:0:0 [ 4] local 192.168.1.34 port 5001 connected with 192.168.1.33 port 45314 [ 4] 0.-10.3068 sec 68.6 MBytes 55.9 Mbits/sec 35906 35901:2:3:0:0:0:0:0 [ 4] local 192.168.1.34 port 5001 connected with 192.168.1.33 port 45316 [ 4] 0.-10.3491 sec 71.6 MBytes 58.1 Mbits/sec 35522 35512:2:4:4:0:0:0:0 [ 4] local 192.168.1.34 port 5001 connected with 192.168.1.33 port 45324 [ 4] 0.-10.3927 sec 75.1 MBytes 60.6 Mbits/sec 35410 35397:7:3:2:1:0:0:0 [ 4] local 192.168.1.34 port 5001 connected with 192.168.1.33 port 45326 [ 4] 0.-10.3910 sec 59.8 MBytes 48.2 Mbits/sec 30683 30675:3:4:1:0:0:0:0 The first run may well have had the wifi at low power: the client had just been woken up a couple of minutes earlier, but it tends to dial that back quite quickly. I left it in for completeness. An rsync right after the last run was 6,906,424.15 bytes/sec, so ~58.65 Mb/s. I think that's a good indicator of being able to trust the historical data from it. I may have the machine in here at some point in the next few days, and will test that too if so. For 1795116, the performance in that scenario (~6' and LOS) was fine: it wasn't that the driver was broken across the board, it just wasn't managing power properly so it fell apart if conditions weren't perfect. (Not saying this is the same bug, just reminding myself what a result like that means). I still need to boot into 16.04 / etc to try and find a working kernel. AFAICT 16.04.6 shipped with one that has the post-1795116 fix in it, so it should be okay off a USB. If not though I'll have to get creative, as there isn't a spare partition on that machine to install to. My notes show 4.15.0-55 as the first version with the old bug fixed. It would be helpful if there was a reasonable way for me to just install that, since there are multiple dist-upgrade's worth of other changes since then. While that specific kernel would be ideal from a testing standpoint, isn't there somewhere I can just grab the current Bionic kernel from, as a dpkg, and just install the damn thing without having to jump through any hoops? Surely there must be a better system in place already than randomly guessing at versions or doing builds on a system that is totally unsuitable for such tasks. :( -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
I expect so. I don't usually have a machine available to run as a server though, hence the preference for rsync. If you're concerned that the NAS might be the bottleneck, don't be. That's a sensible point to raise, but it's GbE and saturates it wired. (To say nothing of the months during which the rsync consistenly hit 80+). If you think iperf might narrow the scope of where to look though, let me know and I'll try it next time I can dedicate a machine to it: shouldn't be more than a week. (hmm - I could run one up in a VM at will, which would still have more than enough network performance for this, but I'm not sure I'd fully trust the results from that until I've got a baseline to compare against. I'll try to remember it when I boot the client off an older kernel). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
The dist-upgrades have wiped out all the previous kernels, of course. The only one left on the machine at all was the 5.0 from 19.04, and that's no good either. :( Linux 5.0.0-29-generic #31-Ubuntu SMP Thu Sep 12 13:05:32 UTC 2019 x86_64 Wed 23-Oct-19 04:47 sent 459,277,171 bytes received 35 bytes 5,635,303.14 bytes/sec The window is too large for me to bisect any time soon. The machine is inconveniently located for such things, but needs to stay there for the testing to be valid; and I don't expect to be able to average more than one build every few days. I'll do what I can to at least narrow things down a little, but since it took more than 6 months to get the last regression fixed after I'd already provided the exact release that introduced it, I'm sure you can understand why I'm not too keen on burning days of my free time on this. 4.15.0-55 is the last *recorded* good, but I did test 18.04 from a USB prior to installing that and hit 80+, so at least one version of 4.18 is okay. I'll re-check that build first just in case, then try a Live 18.04.3. If that one's good, the range would only be 5.0-xx to 5.0-29, and i can probably get that covered in a few weeks. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
That machine doesn't have access to launchpad, so until someone fixes the bugs (referenced out in the other thread) so that "ubuntu-bug -c" works, I can't provide that info. Kai - this is a low-power HTPC, with very little disk space. Assuming it can even clone the kernel, it will likely take weeks for me to bisect the problem. I'll do what I can, but unless we get very lucky it'll be a long time before we have an answer. Remember, the LKG is the 18.04 kernel, which is now mostly 18 months old. :( -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1847892] Re: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Confirmed Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847892/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1847892] [NEW] large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel
Public bug reported: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33 netmask 255.255.255.0 broadcast 192.168.1.255 ether dc:85:de:e4:17:a3 txqueuelen 1000 (Ethernet) RX packets 56608204 bytes 79066485957 (79.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 21634510 bytes 8726094217 (8.7 GB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 No issues of any kind in the week that it's been up. Just terrible performance. I'm painfully aware of all the module's parameters etc, and have tried them all, with no change in the results outside of typical wifi variance. ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete ** Tags: bionic eoan regression rtl8723be wifi ** Project changed: ubuntu-mate => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847892 Title: large performance regression (~30-40%) in wifi with 19.10 / 5.3 kernel Status in linux package in Ubuntu: Incomplete Bug description: Probably relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116 Card is an RTL8723BE. On 16.04 with the HWE stack, after 1795116 was fixed performance was a stable 75-80Mb/s. Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Fri 26-Jul-19 12:28 sent 459,277,171 bytes received 35 bytes 9,278,327.39 bytes/sec Linux 4.15.0-55-generic #60~16.04.2-Ubuntu SMP Thu Jul 4 09:03:09 UTC 2019 x86_64 Sat 27-Jul-19 01:23 sent 459,277,171 bytes received 35 bytes 10,320,836.09 bytes/sec On 18.04, performance was still a stable 75-80Mb/s. After updating to 19.10, performance is typically ~50Mb/s, or about a 37% regression. $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=59/70 Signal level=-51 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 $ ./wifibench.sh Linux 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 Sat 12-Oct-19 20:30 sent 459,277,171 bytes received 35 bytes 5,566,996.44 bytes/sec $ iwconfig wlan0 wlan0 IEEE 802.11 ESSID:"**" Mode:Managed Frequency:2.442 GHz Access Point: 4C:60:DE:FB:A8:AB Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=68/70 Signal level=-42 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:315 Missed beacon:0 So no corrupted packets or etc during that transfer. $ ifconfig wlan0 wlan0: flags=4163 mtu 1500 inet 192.168.1.33
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
That bad run was an outlier. No idea what caused it, but cron'd tests over the past couple of days have all shown results similar to the pre-33 breakage. So it looks like this is finally fixed, thanks. It's a shame testing didn't catch it, but understandable. It's a bit more worrying that the regression took seven months to get repaired, but at least it's all good now. ** Changed in: linux (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Fix Released Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Hooray, it seems that it has - but possibly only partially. Peak and Avg throughput were both a few % down compared to -32, but well within the sort of variance wifi suffers from. High-70s for download is certainly good enough to use. What's less encouraging, to the point of being an outright concern, is the UPLOAD rate. That has consistently peaked at 100Mb/s with -32 over the past several months, with averages not much lower, but remains massively worse in the current kernel: somewhere around 60Mb/s. I've only had time to run one batch of tests on it, so it could have been an extremely unlucky fluke, but like I say, it's worrying. I'll do some more testing when I get the chance. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Thanks, but that seems unlikely: I'm aware of the ant_sel issue on HP laptops etc, but this machine isn't one and has never benefitted from it. If it was using the wrong one of two antennae, it wouldn't hit 70/70 at 20ft away through walls, nor would the throughput be almost half of what it was with the good kernels when registering that signal quality. I'll try it to see, of course, but if it does fix it then the driver's got some drastic bugs with its information reporting! :P -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Although, I see what appears to be an unrelated (to ant_sel) + if (rtlpriv->cfg->ops->get_btc_status()) + rtlpriv->btcoexist.btc_ops->btc_power_on_setting(rtlpriv); added in that commit as well. I can't go digging into the source right now to see what that's doing, but since THIS bug reeks of bad power management you're hopefully right that the patch as a whole will also fix this issue. I'll try it over the weekend - thanks again for the heads up. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Still hopelessly broken. :( Throughput with the latest kernel was down to about 45Mb/s when I tested it a few days ago. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
given the link quality observations in #11 and the behavior in #12, it's pretty clear that the problem is with the radio power management. since it isn't improved at all via any of the PM settings, that suggests it's simply broken rather than overly-aggressive. for reference, the head for the last good version of the driver is 6A56582B1FEECB841E329C4 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
the machine is usually ~20 feet away from the router, through multiple walls and a floor. i moved it last night so it was 6 feet away with LOS, and the results from that are very interesting: Linux brix 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=70/70 Signal level=-30 dBm Sat 20-Oct-18 17:23 429,840,384 100% 10.91MB/s0:00:37 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 11,167,414.42 bytes/sec and under the same ideal conditions: Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=70/70 Signal level=-32 dBm Sat 20-Oct-18 17:29 429,840,384 100%9.10MB/s0:00:45 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 9,449,350.66 bytes/sec so the newer kernel is MUCH better in that situation, whereas the old kernel essentially performs exactly the same. the machine has a fairly weak cpu, and basically has one core pegged with iowait during these transfers, so optimisations (either in general for meltdown etc, or the stack, or in the driver specifically) could certainly account for that sort of speedup. however, that only further highlights just how bad this regression is, because the driver is now nearly 20% faster in the abstract but still massively slower at range despite all that improvement. it also explains why nobody would notice the regression during development. i'm happy to test proposed fixes or provide more information, but i don't think there's anything more i can do at my end until somebody else steps in. @joseph - do you have a tracking reference for upstream yet? TIA -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
> prior to the transfer [on the buggy versions] the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect -32 doesn't seem to have that problem: it's been 70/70 every time i've looked, even with the link speed showing as 15Mb/s rather than 150, indicating power saving. so i modprobed the driver with all the power- saving options (ips, fwlps, and aspm) set to 0 while running one of the broken kernels (i don't remember if it was -36 or the 4.19 build, sorry) to see if that made any difference, but AFAICT it didn't. (i.e. still around 55Mb/s, when -32 was hitting 70+ 5 mins before/after). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
> on channel 8(+4), 4.19 typically performed on par with -32 and older. apparently only because of some fluke. the router switched to 4(+8) some time in the past couple of days, and the newer kernels are certainly sucking hard on that too: --- Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.427 GHz (Channel 4) Link Quality=70/70 Signal level=-36 dBm Sun 07-Oct-18 03:30 429,840,384 100%9.00MB/s0:00:45 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 9,449,350.66 bytes/sec --- Linux brix 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.427 GHz (Channel 4) Link Quality=64/70 Signal level=-46 dBm Sun 07-Oct-18 05:05 429,840,384 100%6.46MB/s0:01:03 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 6,665,821.01 bytes/sec --- this is a major regression. is there any activity on it upstream? i can't imagine it's ALL wifi, or people would be screaming for blood, but it would be good to at least get it in front of larry finger (the rtl driver author) as a starting point. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
so, the methodology is, reboot, wait for things to settle (i.e. for the initial "performance" cpu period ubuntu uses to pass), run a simple script that dumps out some diags and rsyncs that 400MB iso. -- Linux brix 4.19.0-041900rc6-generic #201809301631 SMP Sun Sep 30 16:32:51 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=62/70 Signal level=-48 dBm Wed 03-Oct-18 01:35 429,840,384 100%6.80MB/s0:01:00 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 7,106,536.45 bytes/sec --- Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=62/70 Signal level=-48 dBm Wed 03-Oct-18 01:40 429,840,384 100%6.38MB/s0:01:04 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 6,665,821.01 bytes/sec --- Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=70/70 Signal level=-32 dBm Wed 03-Oct-18 01:43 429,840,384 100%8.14MB/s0:00:50 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,348,455.44 bytes/sec -- that was the best run 4.19 had, at -18%, out of about a dozen. as with 4.15.0-33 and later most were down by 25-30%. so, "still exists" it is. here's where things get weird though... --- Linux brix 4.19.0-041900rc6-generic #201809301631 SMP Sun Sep 30 16:32:51 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.447 GHz (Channel 8) Link Quality=66/70 Signal level=-44 dBm Wed 03-Oct-18 01:12 429,840,384 100%8.07MB/s0:00:50 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,348,455.44 bytes/sec --- on channel 8(+4), 4.19 typically performed on par with -32 and older. on channel 9(+5) though it consistently showed the same regression as -33. again, this is over about a dozen runs (and multiple reboots switching between kernels), not a onetime event. -32 though consistently performed at 70+Mb/s averages regardless of channel. i'm way out of my depth at this point, but that seemed a remarkable weirdness and worth pointing out. :) ** Tags added: kernel-bug-exists-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
ok - it's a failure in the doc, since the kernel image can't be installed without them. also note that the headers package can't be installed on 16.04 because of a change in the ?libssl? dependency. (from memory: might be the wrong dependency). that aside, the results with 4.19 are ... odd, so far. i need to test a bit more before committing to a call. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Incomplete Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
sure, i'll try. sidenote, https://wiki.ubuntu.com/KernelMainlineBuilds is missing any reference to kernel modules, which seem like they might be kind of important for bugs like this. is that a failure in the doc, or is the goal here just to test e.g. the tcp changes in -33 rather than any changes in the device driver itself? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Incomplete Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
marked as confirmed per #3 and #4. i have the apport file stashed away and can upload it as an attachment upon request if anyone's interested. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Confirmed Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
unfortunately, the instructions on https://help.ubuntu.com/community/ReportingBugs don't seem to work: >> If this is to be added to an existing bug report, also use the -u option: ubuntu-bug -c FILENAME.apport -u BUGNUMBER << $ ubuntu-bug -c /mnt/nas/wifi.apport -u 1795116 Usage: ubuntu-bug [options] [symptom|pid|package|program path|.apport/.crash file] ubuntu-bug: error: -u/--update-bug option cannot be used together with options for a new report and since -c is the only option that allows me to specify an apport file, i'm not sure how to proceed from here... -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: Incomplete Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
obviously i've tested this with 32/33/34 a dozen or so times, but the performance regression shows up in all of them, so i've only copied that particular one. the best (i.e. "least bad for the bugged kernel") result so far was "only" -18%, and most runs are down by 25-30%. ** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later Status in linux package in Ubuntu: New Bug description: 16.04 install using the HWE stack. after several weeks of uptime on -32, an update to -34 showed a major drop in wifi throughput, dependent solely on the kernel chosen: $ uname -a && ./wifibench.sh Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:07 PlatformSDK-SVR2003R2.iso 429,840,384 100%8.41MB/s0:00:48 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,685,766.77 bytes/sec $ uname -a && ./wifibench.sh Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Tue 25-Sep-18 06:14 PlatformSDK-SVR2003R2.iso 429,840,384 100%4.83MB/s0:01:24 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 5,028,601.81 bytes/sec (the script is a simple rsync from a NAS. nothing in the NAS, or the router, or the physical positions of the devices or etc etc has changed, let alone in those 7 minutes). there is no interference, no other devices connected, etc. prior to the transfer, the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect: $ iwconfig wlan0 IEEE 802.11 ESSID:"" Mode:Managed Frequency:2.452 GHz Access Point: Bit Rate=150 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:on Link Quality=70/70 Signal level=10 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:15 Missed beacon:0 the client is a J1900-based (baytrail) machine with a RTL8723BE wifi module. average performance while on -32 was consistently 70-80 Mb/s, over a period of several weeks. with -33 and later, it's generally 50-65. (that machine has no access to launchpad. i'll try apport-cli over the weekend). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
