Some further reading on the issue https://www.mail-archive.com/[email protected]/msg87442.html https://forums.whirlpool.net.au/archive/2530363
Regards, Ryan Mounce On 22 December 2017 at 13:25, Ryan Mounce <[email protected]> wrote: > I've experienced this recently myself. In my case I have a 100Mbps > link from my ISP and their shaper will queue up to about 120ms worth > of packets (on top of the ~10ms baseline latency). I run cake in > ingress mode at 99.2Mbps, which has normally been enough to keep > everything in check and keep my ISP's queue empty at least in the > steady state. > > Boot up a Windows 10 PC that's been unused for a few months, let it > update and bam! 100-130ms RTT, family member's Netflix stream in the > next room stalls completely, and running a quick speedtest on a > different machine (that should get ~50% share of the link under normal > circumstances with dual-dsthost) yields about 1.2Mbps on a 100Mbps > link! I performed a quick pcap while this was happening and determined > that Windows Update had started on the order of 120 parallel HTTP > downloads from 2 different Akamai cache IPs (within my ISP's network > 20ms away). > > The 20ms jump in latency in your case just indicates that there is a > small buffer in your DSLAM, however it is still being flooded by the > parallel transfers from the CDN. > > Windows 10 probably deserves most of the blame for opening so many > parallel connections, however I think there is also some concern here > with Akamai's FastTCP not responding to congestion signals. > > Regards, > Ryan Mounce > > > On 22 December 2017 at 12:31, Rich Brown <[email protected]> wrote: >> I'm using LEDE 17.01.4 on my Archer C7v2. I have a 7mbps/768kbps ADSL2+ >> connection through Fairpoint. The modem stats page shows its "attainable >> rates" (kbps): 13330/1272 and Rates: 8271/1181. My SQM settings are: >> >> Download: 7000 (kbps) >> Upload: 925 >> Queue Disc: Cake/piece_of_cake.qos >> Link Layer: ATM/44 bytes overhead >> Advanced Options: default >> >> I have noticed that Win10 updates cause the network connection to become >> unusable for other services/people, as if I had bufferbloat. But ping times >> remain stable - they jump from ~20-22 msec unloaded to 40-50 msec. >> >> Experiments I have tried: >> >> - Setting download speed to 5000 makes the connection usable for other >> people, although the ping times remain about the same (40-50 msec) >> >> - Setting the download speed to 8600 still keeps ping times down, but that >> really harms other people's performance. >> >> - The link rates (download and upload) seem to track the SQM setting, >> measured with both YAMon and the built-in real-time graphs. I get ~6,000 >> kbps with a 7000 download setting, I got ~3,000kbps at the 5000 setting. I >> get ~8500 kbps after setting download to 8600. >> >> - This doesn't seem to happen when I'm downloading other kinds of files (I >> haven't tried torrenting files...) Downloading non-Win10 update files seems >> to leave the connection in a fairly responsive state. >> >> Any thoughts? What other experiments should I make? Thanks! >> >> Rich >> _______________________________________________ >> Bloat mailing list >> [email protected] >> https://lists.bufferbloat.net/listinfo/bloat _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
