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 : root@goulash ~ # 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] To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1297487/+subscriptions
