Date: Sat, 16 Dec 2017 16:45:11 +0100 (CET) From: Jimmy Olgeni <olgeni@olgeni.com> To: Baptiste Daroussin <bapt@FreeBSD.org> Cc: Peter Jeremy <peter@rulingia.com>, svn-src-stable@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, svn-src-stable-11@freebsd.org Subject: Re: svn commit: r326619 - stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <alpine.BSF.2.21.1712161640430.30433@olgeni.olgeni> In-Reply-To: <20171213185214.GA12026@server.rulingia.com> References: <201712061001.vB6A12Ot032201@repo.freebsd.org> <20171213185214.GA12026@server.rulingia.com>
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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
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