[Bug 229670] ZFS ARC limit vfs.zfs.arc_max from /boot/loader.conf is not respected

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229670

--- Comment #8 from Josh Paetzel <jpaetzel at FreeBSD.org> ---
<jpaetzel> Is there any case where ARC usage can exceed arc_max legitimately?


<mahrens> I want to say no, but your example is with arc_max=128MB so there may
be some exceptions at that small of a size (only 8 maximum-size blocks!).  Also
stuff can get pinned in memory (and can’t be evicted regardless of ARC
settings) when it’s “in use”, which is the case for metadata of open files,
mounted filesystems, etc.

It’s a hard limit on the *target* ARC size.

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