[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 #34 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
(In reply to Sylvain Galliano from comment #33)
Ok, thanks. At this point it's clear that there are two indipendent issues that
slow down netmap-iflib on ix/ixl. The first is the lack of a per-tx-queue
netmap timer (or taskqueue). The second is the lack of descriptor writeback
moderation in ixl.
We can start by merging the timer patch, and then work on the separate ixl
issue.

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