[Bug 248652] netmap: pkt-gen TX huge pps 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 #3 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
It looks like you get 2.6 Mpps because you are not getting enough interrupts...
have you tried to measure the interrupt rate in the two cases (current vs 11,
no busy wait)?
Intel NICs have tunables to set interrupt coalescing, for both TX and RX. Maybe
playing with those changes the game?

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