Ubuntu
xen-3.3 package

  1. Bug #154271
  2. Activity log

Activity log for bug #154271

Date Who What changed Old value New value Message
2007-10-19 09:27:47 Andreas Jellinghaus bug added bug
2008-05-31 09:40:56 agent 8131 bug assigned to xen-3.2 (Ubuntu)
2008-05-31 09:42:10 agent 8131 xen-3.1: status New Confirmed
2009-07-13 11:16:37 runout bug task added xen-3.3 (Ubuntu)
2009-07-13 14:16:33 Paul Waldo removed subscriber Paul Waldo
2009-07-13 20:44:53 runout summary xenU sending too big packets on ubuntu 7.10 "gutsy" xenU sending too big packets
2009-07-13 21:16:12 agent 8131 xen-3.2 (Ubuntu): status New Confirmed
2009-07-13 21:16:42 agent 8131 xen-3.3 (Ubuntu): status New Confirmed
2010-11-17 13:37:39 Andy Whitcroft bug task added linux (Ubuntu)
2010-11-17 13:38:54 Andy Whitcroft description 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 <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 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) so the MTU is 1500 which is fine. xenU sending too big packets. 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 <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 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) 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
2010-11-17 13:40:30 Andy Whitcroft bug added subscriber John Johansen
2010-11-17 13:40:41 Andy Whitcroft bug added subscriber Stefan Bader
2010-11-17 13:41:35 Petri Lehtinen bug added subscriber Petri Lehtinen
2010-12-01 17:36:18 Jeremy Foshee tags review-request
2010-12-01 19:13:33 Andreas Jellinghaus removed subscriber Andreas Jellinghaus
2011-09-17 16:43:56 Brad Figg linux (Ubuntu): status New Incomplete
2011-09-21 06:07:42 Hurl removed subscriber Hurl
2013-06-14 15:51:05 Phillip Susi xen-3.3 (Ubuntu): status Confirmed Incomplete
2018-01-03 15:34:17 dino99 xen-3.3 (Ubuntu): status Incomplete Invalid
2018-01-03 15:34:21 dino99 xen-3.2 (Ubuntu): status Confirmed Invalid
2018-01-03 15:34:24 dino99 xen-3.1 (Ubuntu): status Confirmed Invalid
2018-01-03 15:34:28 dino99 linux (Ubuntu): status Incomplete Invalid