> Hmm, I think this could be caused by this commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a6b2a1dc2a2105f178255fe495eb914b09cb37a
>
>...which makes TCP always use GSO.
Yes, the commit does seem to cause the issue.
> This was introduced in Linux 4.17; is there any chance you could test that
> the difference appeared in that version?
Yes, I've attached the test results below to show the difference:
Linux v4.15+ (v4.15 after cherry-picking commit
0a6b2a1dc2a2105f178255fe495eb914b09cb37a)
[tcp_50up-2019-01-09T112855.608326.flent.gz](https://github.com/tohojo/flent/files/2740516/tcp_50up-2019-01-09T112855.608326.flent.gz)
[tcp_50up-2019-01-09T112855.608326.log](https://github.com/tohojo/flent/files/2740517/tcp_50up-2019-01-09T112855.608326.log)
Linux v4.20+ (v4.20 after reverting commit
0a6b2a1dc2a2105f178255fe495eb914b09cb37a)
[tcp_50up-2019-01-09T160015.324582.flent.gz](https://github.com/tohojo/flent/files/2740518/tcp_50up-2019-01-09T160015.324582.flent.gz)
[tcp_50up-2019-01-09T160015.324582.log](https://github.com/tohojo/flent/files/2740519/tcp_50up-2019-01-09T160015.324582.log)
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