[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 #9 from Leif Pedersen <leif at ofWilsonCreek.com> ---
So consider the numbers in this example: Are we saying that this behavior is
"correct"?

I have a machine with 6GB of RAM and top shows the ARC is running at 2556 MB.
Arc_max was set to 256MB at boot, so it was overshooting by ~10x. I bumped
arc_max to 2GB with sysctl[1], and the ARC usage stayed at 2556 MB.

[1]
$ sysctl vfs.zfs.arc_max=2147483648
vfs.zfs.arc_max: 268435456 -> 2147483648

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