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

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

--- Comment #106 from Olivier Certner <olce@FreeBSD.org> ---
Still could not spend much time on it today, tomorrow should be OK.  I'll start
with D44170.

(In reply to Anton Saietskii from comment #102)

Yes, 64GB is already plenty.  Actually, this is what I have on the machines
running poudriere.  The main difference to your configuration is that I'm using
`USE_TMPFS=no`.  Thanks for detailing your reproducer, I'll try something
similar and report.

(In reply to Mark Millard from comment #104)

Seems to be in line with Anton's reporting.  I may try with some LLVM, should
be easier (less dependencies).

(In reply to karl from comment #105)

You're mentioning the ARC thread.  Are both your source and object directories
on ZFS?  How much RAM?  Are you able to trigger the problem after a fresh boot
and immediately running buildworld and buildkernel?

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