[Bug 248652] iflib: netmap pkt-gen large TX performance difference between 11-STABLE and 12-STABLE/CURRENT on ix & ixl NIC

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248652

--- Comment #28 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
(In reply to Sylvain Galliano from comment #26)
Thanks.

I just figured out that there may be a major flaw introduced by the porting of
ixl to iflib. This flaw should couse too many writebacks from the NIC to report
completed transmissions, even if iflib asks for a writeback once in a while.

Can you please run again your tests on ixl with the latest patch?

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