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

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 02 Apr 2024 16:40:42 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275594

--- Comment #103 from karl@denninger.net ---
Interesting....

I'm on FreeBSD 13.3-STABLE stable/13-n257639-51b2556ee60a KSD-SMP, just rebuild
world/kernel/nanoBSD for some of my pcEngines machines.

The builds are complete but I have a load average over 12 (!!) and the only
thing that is sucking up all manner of CPU is:

  17  -  DL     7:51.59 [vnlru]

which definitely is (the machine was just rebooted, so that's rather
significant all things considered.)

Is this related?  Not sure, but it looks like it might be....I don't generally
run poudriere builds on this box, but do build world and kernel on it
pretty-regularly, plus cross-builds using Crochet for Pis.

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