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Date:      Wed, 18 Jul 2018 18:24:27 +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-okCUgQOMFZ@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 #12 from Leif Pedersen <leif@ofWilsonCreek.com> ---
Fixing maxvnodes seems to have sorted out the problem. Here's the top heade=
r,
in case it bears any more investigation.

last pid:  8729;  load averages:  0.16,  0.15,  0.10=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                                                    up 0+18:24:10  11:07:00
36 processes:  1 running, 35 sleeping       0.0              100
CPU: 8040% user,  0.0% nice,  0.0% system,  0.0% interrupt,  0.0% idle
Mem: 796K Active, 27M Inact, 81M Laundry, 5631M Wired, 155M Free
ARC: 2639M Total, 643M MFU, 317M MRU, 972K Anon, 16M Header, 1663M Other
     195M Compressed, 765M Uncompressed, 3.92:1 Ratio
Swap:=20

When I cut maxvnodes from 1048576 to 524288, the ARC Total dropped from 263=
9MB
to 1455MB over about 30 seconds. Further reducing maxvnodes brought the Tot=
al
down below the configured arc_max.

Thanks!

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