[Bug 154271] Re: xenU sending too big packets
closing that old report, as it has not got recent comment. ** Changed in: xen-3.3 (Ubuntu) Status: Incomplete => Invalid ** Changed in: xen-3.2 (Ubuntu) Status: Confirmed => Invalid ** Changed in: xen-3.1 (Ubuntu) Status: Confirmed => Invalid ** Changed in: linux (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/154271 Title: xenU sending too big packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/154271/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets
The xen-3.3 source package has been superceeded by the xen package. If you still have this issue on 12.04 or later, please reassign to there. ** Changed in: xen-3.3 (Ubuntu) Status: Confirmed = Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/154271 Title: xenU sending too big packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/154271/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets
** Tags added: review-request -- xenU sending too big packets https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets
Actually, on xenU, issuing the commands ethtool -K eth0 tx off ethtool -K eth0 tx on fixes the problem too, so changing the tx offloading back to on doesn't break it again. And the real problem here is that xenU keeps sending big packets even though it gets the fragmentation needed info. I don't have a tcpdump to copy-paste at hand right now, but for me it looked like this: xenU target: length 2948 firewall xenU: ICMP fragmentatinon needed xenU destination: length 1480 target xenU: ACK xenU target: length 2948 firewall xenU: ICMP fragmentatinon needed So xenU is sending too big packets over and over again, and firewall has to ask it to fragment them each time. And this hurts performance REALLY hard. -- xenU sending too big packets https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets
s/destination/target/g in the hand-written tcpdump lookalike in comment #5 if you're confused :) -- xenU sending too big packets https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets
** Also affects: linux (Ubuntu) Importance: Undecided Status: New ** Description changed: etup: amd64, xen0 = ubuntu 7.10 (gutsy), xenU = ubuntu 7.10 (gutsy), network config with xenU routing via xen0. scp xenU:file . very slow, ~50KB/s scp xen0:file . several MB/s on xen0: scp xenU:file . many MB/s had a look at tcpdump, I see lines like this: - 10:55:30.319389 IP (tos 0x8, ttl 64, id 59286, offset 0, flags [DF], proto TCP - (6), length 2948) xenU.22 desktop: . 47785:50681(2896) ack 0 win 404 + 10:55:30.319389 IP (tos 0x8, ttl 64, id 59286, offset 0, flags [DF], proto TCP + (6), length 2948) xenU.22 desktop: . 47785:50681(2896) ack 0 win 404 nop,nop,timestamp 20681576 687514747 - 10:55:30.319399 IP (tos 0xc8, ttl 64, id 52994, offset 0, flags [none], proto - ICMP (1), length 576) xen0 xenU: ICMP desktop unreachable - need to frag - (mtu 1500), length 556 IP (tos 0x8, ttl 64, id 59286, offset 0, flags [DF], - proto TCP (6), length 2948) xenU.22 desktop.41056: . 47785:50681(2896) ack + 10:55:30.319399 IP (tos 0xc8, ttl 64, id 52994, offset 0, flags [none], proto + ICMP (1), length 576) xen0 xenU: ICMP desktop unreachable - need to frag + (mtu 1500), length 556 IP (tos 0x8, ttl 64, id 59286, offset 0, flags [DF], + proto TCP (6), length 2948) xenU.22 desktop.41056: . 47785:50681(2896) ack 0 win 404 nop,nop,timestamp 20681576 687514747[|icmp] so the xenU is sending packets with size 2948? why? ifconfig on xenU: - eth0 Link encap:Ethernet HWaddr 00:16:3E:6D:03:2D - inet addr:xenU Bcast:... Mask:255.255.255.255 - inet6 addr: fe80::216:3eff:fe6d:32d/64 Scope:Link - UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 - RX packets:34918213 errors:0 dropped:0 overruns:0 frame:0 - TX packets:34262839 errors:0 dropped:0 overruns:0 carrier:0 - collisions:0 txqueuelen:1000 - RX bytes:12337072144 (11.4 GB) TX bytes:48486812526 (45.1 GB) + eth0 Link encap:Ethernet HWaddr 00:16:3E:6D:03:2D + inet addr:xenU Bcast:... Mask:255.255.255.255 + inet6 addr: fe80::216:3eff:fe6d:32d/64 Scope:Link + UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 + RX packets:34918213 errors:0 dropped:0 overruns:0 frame:0 + TX packets:34262839 errors:0 dropped:0 overruns:0 carrier:0 + collisions:0 txqueuelen:1000 + RX bytes:12337072144 (11.4 GB) TX bytes:48486812526 (45.1 GB) so the MTU is 1500 which is fine. xenU sending too big packets. + + == WORK AROUND == + + It seems that turning off TX checksum offloading within the domU + eliminates the issue: + + ethtool -K ethN tx off -- xenU sending too big packets https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets on ubuntu 7.10 gutsy
still the same problem on xen 3.3 (hardy backports amd64) ** Also affects: xen-3.3 (Ubuntu) Importance: Undecided Status: New -- xenU sending too big packets on ubuntu 7.10 gutsy https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets
** Summary changed: - xenU sending too big packets on ubuntu 7.10 gutsy + xenU sending too big packets -- xenU sending too big packets https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets
** Changed in: xen-3.2 (Ubuntu) Status: New = Confirmed ** Changed in: xen-3.3 (Ubuntu) Status: New = Confirmed -- xenU sending too big packets https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets on ubuntu 7.10 gutsy
I can confirm this behavior in Xen 3.1. I have left checksums off in Xen 3.2 so cannot verify that it is still a problem. ** Also affects: xen-3.2 (Ubuntu) Importance: Undecided Status: New ** Changed in: xen-3.1 (Ubuntu) Status: New = Confirmed -- xenU sending too big packets on ubuntu 7.10 gutsy https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets on ubuntu 7.10 gutsy
this also affects sarge, etch, lenny and probably all the other domU installations. the ethtool fix works, but it would really be nice if this would get fixed. -- xenU sending too big packets on ubuntu 7.10 gutsy https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 154271] Re: xenU sending too big packets on ubuntu 7.10 gutsy
ethtool -K eth0 tx off in xenU fixes the problem. -- xenU sending too big packets on ubuntu 7.10 gutsy https://bugs.launchpad.net/bugs/154271 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
