Re: 14.4 High CPU ARC issue

Christos Chatzaras <[email protected]> Mon, 27 Apr 2026 13:25:10 +0300

Newsgroups	gmane.os.freebsd.questions
Message-ID	<[email protected]>

> On 27 Apr 2026, at 12:18, Paul Macdonald <[email protected]> wrote:
> 
> Posting in case it helps someone.
> 
> We had a a couple of boxes displaying unusally high cpu ( specifically system loads)
> 
> After spotting the link below, we resolved by increasing the ARC max
> 
> https://forums.freebsd.org/threads/high-cpu-and-severe-slowdown-on-freebsd-14-4-openzfs-2-2-9-with-lower-vfs-zfs-arc-max.102233/

I am the one who created that FreeBSD forum thread. I also opened a bug report with OpenZFS here:

https://github.com/openzfs/zfs/issues/18397

In my case, to fix the issue I disabled setting a custom value for vfs.zfs.arc.max