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Diffstat (limited to 'results/classifier/deepseek-2-tmp/output/network/1297487')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/output/network/1297487 | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/results/classifier/deepseek-2-tmp/output/network/1297487 b/results/classifier/deepseek-2-tmp/output/network/1297487 deleted file mode 100644 index 93cd9cf1..00000000 --- a/results/classifier/deepseek-2-tmp/output/network/1297487 +++ /dev/null @@ -1,169 +0,0 @@ - -MTU not honored in virtio vnet - -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] \ No newline at end of file |