https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=143622

--- Comment #6 from Andrey V. Elsukov <a...@freebsd.org> ---
(In reply to Kristof Provost from comment #5)
> (In reply to Max Laier from comment #2)
> While rmlocks are relatively lightweight there is still a non-zero overhead.
> For the purposes of a test the lock can simply be removed, and without it I
> see ~2% more packets per second in pf than with it.
> I've been thinking about replacing it with a CK_LIST and epoch based
> cleanup, but I stopped working on it when I spotted that ipfw relies on the
> lock. It should be possible to move that into ipfw, but I'm not sure the 2%
> is worth that work.

You can try to revert/rework this change and move IPFW_PF_RLOCK() back to the
ipfw, and then you will be able to change pfil interface locking.

https://svnweb.freebsd.org/base/head/sys/netpfil/ipfw/ip_fw_private.h?r1=314716&r2=316461

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