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Date:      Tue, 17 Jul 2018 19:20:13 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 229670] ZFS ARC limit vfs.zfs.arc_max from /boot/loader.conf is not respected
Message-ID:  <bug-229670-227-rMmzBupEHO@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-229670-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-229670-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D229670

--- Comment #9 from Leif Pedersen <leif@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 M=
B.
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=3D2147483648
vfs.zfs.arc_max: 268435456 -> 2147483648

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