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.

This was introduced in Linux 4.17; is there any chance you could test that the difference appeared in that version?

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