[Bug 243392] if_vmx(4): Input buffer corruption

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243392

--- Comment #6 from Andriy Gapon <avg at FreeBSD.org> ---
I probably should open a new bug for my side of the things as my problem can be
different from the original problem reported here.
But for the moment here is a new bit of information.

I tried to gather a little bit more of information with tcpdump and I got a
very surprising result.
If I run tcpdump on the vmx side, then the copy speed never degrades.
If I start copying before starting tcpdump then the speed can degrade, but as
soon as I start tcpdump (on the vmx side) the speed immediately recovers.
I have tested that many times with the same result.

It seems that enabling bpf changes the packet processing flow and works around
whatever problem there is.
Does anyone have an idea what that change could be and where to dig further?
Thanks!

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