[Bug 276760] vtnet driver incorrectly calculates checksums

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276760

--- Comment #35 from Michael Tuexen <tuexen@freebsd.org> ---
(In reply to vova from comment #30)
Thanks for doing these measurements!

Some comments:
* Your system and my system are completely different. So I do not expect the
same
  numbers. I was just comparing the numbers between turning offload on and off.
  For my system, this does not make much of a difference. And I am not
expecting
  that, because my system is not CPU limited, and all the offload stuff is
about
  reducing CPU cycles. So it behaves expected.
* Is the sysctl output from 14.3 or stable/14? hw.vtnet.lro_disable == 1 is the
  default now in stable/14, which disables HW LRO (not software LRO). But 
  dev.vtnet.0.rxq0.host_lro == 216036 indicates that 216036 HW LRO was
performed.
  That seems strange.
* The numbers seems to indicate that on stable/14 the receive rate drops by 30%
when
  you disable tso4, tso6, lro, and rxcsum. That is suspicious. I would assume
that tso6 is irrelevant assuming that you use IPv4. Can you double check that?
Also try disabling lro but keep rxcsum. disabling rxcsum should automatically
disable lro. And I would not expect tso to have an impact on receiving data.

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