svn commit: r326619 - stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Peter Jeremy]

On 2017-Dec-19 15:15:38 +0100, Baptiste Daroussin <bapt at FreeBSD.org> wrote:
>On Thu, Dec 14, 2017 at 05:52:15AM +1100, Peter Jeremy wrote:
>> 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"
>> 
>
>You are running an issue on head? or on stable/11? Given you are reporting the
>issue on the MFC commit

I'm running into the problem on stable/11.  Sorry for not making that clear.

-- 
Peter Jeremy
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