[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 #5 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
Ok, thanks for the feedback. That means that the issue is that iflib is not
asking enough TX descriptor writebacks. Need for some investigation in the
iflib txsync routine.

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