[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

Krzysztof Galazka <krzysztof.galazka at intel.com> changed:

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                 CC|                            |krzysztof.galazka at intel.com

--- Comment #30 from Krzysztof Galazka <krzysztof.galazka at intel.com> ---
(In reply to Vincenzo Maffione from comment #28)

Hi Vincenzo,

Good catch! Thanks a lot! The non-iflib version of ixl also sets a request
status flag on all 'End of packet' descriptors. I'm guessing that the
difference in performance is related to a dynamic interrupt moderation, which
is disabled by default in iflib version of the driver. I'm a bit concerned
though about the 1 queue case. It think it would be good to put this fix in a
separate review and let our validation team run some tests. Would you like me
to do it or do you prefer to do it yourself?

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