svn commit: r326619 - stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
Peter Jeremy
peter at rulingia.com
Wed Dec 13 18:52:36 UTC 2017
On 2017-Dec-06 10:01:02 +0000, Baptiste Daroussin <bapt at FreeBSD.org> wrote:
>Author: bapt
>Date: Wed Dec 6 10:01:02 2017
>New Revision: 326619
>URL: https://svnweb.freebsd.org/changeset/base/326619
>
>Log:
> MFC r325851:
>
> remove the poor emulation of the IllumOS needfree global variable to prevent
> the ARC reclaim thread running longer than needed.
>
This change appears to break the backpressure mechanism that forces
ARC to release wired memory. Running FreeBSD/amd64 r326743, I found
that my system was thrashing badly with almost all memory (~31GB out
of 32GB) wired (including 19GB ARC, 7GB VBox guests). Running a tool
that just allocates and dirties a large amount of memory had no effect
on the ARC size. Reverting this change only restores normal behaviour
where ARC will shrink under pressure.
My ZFS boot tunables are:
vfs.zfs.arc_max="24G"
vfs.zfs.arc_meta_limit="12G"
--
Peter Jeremy
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