[Bug 275594] High CPU usage by arc_prune; analysis and fix

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275594

--- Comment #94 from Felix Palmen <zirias@freebsd.org> ---
(In reply to Felix Palmen from comment #89)
> will continue to observe the overall behavior.

After a pretty busy (for my ZFS pool) week with the patches applied, I'd say
the behavior is very good now. Provoking stalls requires crazy things like
multiple poudriere-builds in I/O heavy phases (like *-depends) at the same time
and also doing other I/O (e.g. in bhyve VMs). A "normal" bulk build with full
parallel jobs *and* MAKE_JOBS allowed is barely noticeable when scheduled on
idprio.

As I said, it was always sub-optimal on 13.x, but became utterly unusable with
13.3-RELEASE. What I forgot to mention is: on 13.3, there were even EBADFs
suddenly popping up for build jobs, which could very well be some "hidden" bug
that's only triggered by excessively bad performance...

All in all, I personally think this issue desperately needs fixing; depending
on your hardware(?) and workload pattern, you can't really use 13.3 without
patches right now.

Is anyone active reviewing the code?

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