[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 #23 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
(In reply to Sylvain Galliano from comment #21)
Thanks.
The CPU utilization at least tells us that we are not CPU bound.
Could you please perform some tests with the second patch?
It's basically the same as the first one, with a couple of changes that should
ensure a more timely recovery of consumed TX slots (and a more timely timer
firing).

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