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[Qemu-devel] [Bug 1297487] Re: MTU not honored in virtio vnet
|
From: |
Pierre Schweitzer |
|
Subject: |
[Qemu-devel] [Bug 1297487] Re: MTU not honored in virtio vnet |
|
Date: |
Mon, 05 May 2014 09:32:43 -0000 |
ii libselinux1 2.1.0-4.1ubuntu1
SELinux runtime shared libraries
ii linux-firmware 1.79.12
Firmware for Linux kernel drivers
ii linux-headers-3.2.0-60 3.2.0-60.91
Header files related to Linux kernel version 3.2.0
ii linux-headers-3.2.0-60-generic 3.2.0-60.91
Linux kernel headers for version 3.2.0 on 64 bit x86 SMP
ii linux-headers-3.2.0-61 3.2.0-61.92
Header files related to Linux kernel version 3.2.0
ii linux-headers-3.2.0-61-generic 3.2.0-61.92
Linux kernel headers for version 3.2.0 on 64 bit x86 SMP
ii linux-headers-server 3.2.0.61.72
Linux kernel headers on Server Equipment.
rc linux-image-2.6.32-21-server 2.6.32-21.32
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-22-server 2.6.32-22.36
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-24-server 2.6.32-24.43
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-25-server 2.6.32-25.45
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-26-server 2.6.32-26.48
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-27-server 2.6.32-27.49
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-29-server 2.6.32-29.58
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-30-server 2.6.32-30.59
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-33-server 2.6.32-33.72
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-34-server 2.6.32-34.77
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-35-server 2.6.32-35.78
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-37-server 2.6.32-37.81
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-38-server 2.6.32-38.83
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-39-server 2.6.32-39.86
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-40-server 2.6.32-40.87
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-2.6.32-41-server 2.6.32-41.88
Linux kernel image for version 2.6.32 on x86_64
rc linux-image-3.2.0-24-generic 3.2.0-24.39
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-25-generic 3.2.0-25.40
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-26-generic 3.2.0-26.41
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-27-generic 3.2.0-27.43
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-29-generic 3.2.0-29.46
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-30-generic 3.2.0-30.48
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-31-generic 3.2.0-31.50
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-32-generic 3.2.0-32.51
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-33-generic 3.2.0-33.52
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-34-generic 3.2.0-34.53
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-35-generic 3.2.0-35.55
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-36-generic 3.2.0-36.57
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-37-generic 3.2.0-37.58
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-38-generic 3.2.0-38.61
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-39-generic 3.2.0-39.62
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-40-generic 3.2.0-40.64
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-41-generic 3.2.0-41.66
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-43-generic 3.2.0-43.68
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-44-generic 3.2.0-44.69
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-45-generic 3.2.0-45.70
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-48-generic 3.2.0-48.74
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-49-generic 3.2.0-49.75
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-51-generic 3.2.0-51.77
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-52-generic 3.2.0-52.78
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-53-generic 3.2.0-53.81
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-54-generic 3.2.0-54.82
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-55-generic 3.2.0-55.85
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-56-generic 3.2.0-56.86
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
rc linux-image-3.2.0-57-generic 3.2.0-57.87
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii linux-image-3.2.0-58-generic 3.2.0-58.88
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii linux-image-3.2.0-59-generic 3.2.0-59.90
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii linux-image-3.2.0-60-generic 3.2.0-60.91
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii linux-image-3.2.0-61-generic 3.2.0-61.92
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii linux-image-3.8.0-33-generic 3.8.0-33.48~precise1
Linux kernel image for version 3.8.0 on 64 bit x86 SMP
ii linux-image-server 3.2.0.61.72
Linux kernel image on Server Equipment.
ii linux-libc-dev 3.2.0-61.92
Linux Kernel Headers for development
ii linux-server 3.2.0.61.72
Complete Linux kernel on Server Equipment.
ii qemu-common 1.0+noroms-0ubuntu14.14 qemu
common functionality (bios, documentation, etc)
ii qemu-kvm 1.0+noroms-0ubuntu14.14 Full
virtualization on i386 and amd64 hardware
ii qemu-utils 1.0+noroms-0ubuntu14.14 qemu
utilities
ii util-linux 2.20.1-1ubuntu3
Miscellaneous system utilities
And atm, running :
address@hidden ~ # uname -a
Linux goulash 3.8.0-33-generic #48~precise1-Ubuntu SMP Thu Oct 24 16:28:06 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1297487
Title:
MTU not honored in virtio vnet
Status in QEMU:
New
Status in “qemu-kvm” package in Ubuntu:
Confirmed
Bug description:
I am observing a potential regression/different behavior between rel.
14.04 (dev branch) and release 13.04.
My hardware is: Cisco UCS blade B200-M3 and the network adapter card:
Cisco UCS VIC 1240.
lsb_release -rd
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
uname -a
Linux konan2 3.13.0-19-generic #40-Ubuntu SMP Mon Mar 24 02:36:06 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
The problem:
After starting a kvm with virtio interfaces I am passing HTTP traffic via an
external network traffic simulator.
The tool is sending a TCP packet of 3481B, because the tool MTU is set to
1400B, it splits the packets into 3 TCP segments.
When the 3 segments are received at the host eth1 interface, the host (ubuntu
14.04) reassembles the TCP packets into a larger packet (GRO), then passes the
packet up on vnet1. At this point, because vnet1 MTU is 1500B, it is supposed
to re-segment the packet and pass the 3 segments up to the VM. But it passes
the big 3481B packet instead.
This behavior did not happen when I tried the same scenario in release
13.04
I can disable this behavior by disabling TSO (TCP segment offloading
in the vnet), but I did not have to do this in rel. 13.04 and I feel
the MTU is not honored as it should be with rel. 14.04.
ip link show | grep eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br1 state
UP mode DEFAULT group default qlen 1000
ip link show | grep vnet1
16: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master
br1 state UNKNOWN mode DEFAULT group default qlen 500
I am attaching two tcpdump/pcap traces that show a TCP transaction
passing on vnet1 when TSO is on and when TSO is off.
Please see:
- vnet1_tso_on.pcap
- vnet1_tso_off.pcap
in attachment.
I noticed there was a driver upgrade in rel. 14.04:
in 14.04:
ethtool -i eth1
driver: enic
version: 2.1.1.50
firmware-version: 2.1(3a)
bus-info: 0000:07:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
ethtool -i vnet1
driver: tun
version: 1.6
firmware-version:
bus-info: tap
supports-statistics: no
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
ethtool -k vnet1
Features for vnet1:
rx-checksumming: off [fixed]
tx-checksumming: on
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: on
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: on
tcp-segmentation-offload: off
tx-tcp-segmentation: off
tx-tcp-ecn-segmentation: off
tx-tcp6-segmentation: off
udp-fragmentation-offload: on
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: off [fixed]
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: off [fixed]
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-ipip-segmentation: off [fixed]
tx-sit-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-mpls-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: on
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]
tx-vlan-stag-hw-insert: on
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off [fixed]
in 13.04 :
ethtool -i eth1
driver: enic
version: 2.1.1.39
firmware-version: 2.1(3a)
bus-info: 0000:07:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
ethtool -i vnet1
driver: tun
version: 1.6
firmware-version:
bus-info: tap
supports-statistics: no
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
ethtool -k vnet1
Features for vnet1:
rx-checksumming: off [fixed]
tx-checksumming: on
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: on
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: on
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: on
tx-tcp6-segmentation: on
udp-fragmentation-offload: on
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: off [fixed]
tx-vlan-offload: off [fixed]
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: off [fixed]
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
fcoe-mtu: off [fixed]
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