Public bug reported:
The TSO (TCP segmentation offload), By default it is shown to be ON, but
actually aggregation doesn’t happen.
When turning it on again - aggregation is observed.
Same behavior for mlx4_en, mlx5_core, igb.
Steps to repro:
1.
root:~# uname -r
4.10.0-14-generic
2.
root:~# ethtool -i eno2
driver: igb
version: 5.4.0-k
firmware-version: 1.63, 0x800009fa
expansion-rom-version:
bus-info: 0000:06:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no
3.
root:~# ethtool -k eno2 | grep offload
tcp-segmentation-offload: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: on
tx-vlan-offload: on
l2-fwd-offload: off [fixed]
hw-tc-offload: off [fixed]
4.
root@:~# ethtool -K eno2 gso off
5.
root@:~# ethtool -k eno2 | grep offload
tcp-segmentation-offload: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: off
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: on
tx-vlan-offload: on
l2-fwd-offload: off [fixed]
hw-tc-offload: off [fixed]
6.
netperf -H 10.195.43.1 -l 4 -t TCP_STREAM -c -C -- -m 15000
Traffic size less or equal to 1514 is observed, despite the fact TSO is on.
7.
ethtool -K eno2 tso on
8.
netperf -H 10.195.43.1 -l 4 -t TCP_STREAM -c -C -- -m 15000
Traffic size of 64K is observed.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1678585
Title:
[Zesty] TSO doesn't work properly
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