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From: Jimmy Olgeni <olgeni@olgeni.com>
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To: Baptiste Daroussin <bapt@FreeBSD.org>
cc: Peter Jeremy <peter@rulingia.com>, svn-src-stable@freebsd.org, 
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Subject: Re: svn commit: r326619 -
 stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Hi,

On Thu, 14 Dec 2017, Peter Jeremy wrote:

> On 2017-Dec-06 10:01:02 +0000, Baptiste Daroussin <bapt@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.

Are there any updates on this?

-- 
jimmy