[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 #45 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
(In reply to Sylvain Galliano from comment #43)
Ugh.
Thanks for reporting.

I indeed introduced a subtle typo bug, using callout_reset_sbt() rather than
callout_reset_sbt_on() (as intended). Therefore I was passing the "cpu" value
to the "flags" argument, resulting in a disaster. In your test this probably
triggered the C_DIRECT_EXEC flag of callout(9), so that the timer was being
executed in hardware interrupt context.

I uploaded the patch that is now consistent with the src tree (that I'm going
to fix right away).

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