Date: Thu, 21 Dec 2017 05:55:56 +1100 From: Peter Jeremy <peter@rulingia.com> To: Baptiste Daroussin <bapt@FreeBSD.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@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: <20171220185556.GB5042@server.rulingia.com> In-Reply-To: <20171219141538.f7o2ujntckaguhq2@ivaldir.net> References: <201712061001.vB6A12Ot032201@repo.freebsd.org> <20171213185214.GA12026@server.rulingia.com> <20171219141538.f7o2ujntckaguhq2@ivaldir.net>
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--3lcZGd9BuhuYXNfi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2017-Dec-19 15:15:38 +0100, Baptiste Daroussin <bapt@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@FreeBSD.org> wro= te: >> >Author: bapt >> >Date: Wed Dec 6 10:01:02 2017 >> >New Revision: 326619 >> >URL: https://svnweb.freebsd.org/changeset/base/326619 >> > >> >Log: >> > MFC r325851: >> > =20 >> > remove the poor emulation of the IllumOS needfree global variable to = prevent >> > the ARC reclaim thread running longer than needed. >> > =20 >>=20 >> 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. >>=20 >> My ZFS boot tunables are: >> vfs.zfs.arc_max=3D"24G" >> vfs.zfs.arc_meta_limit=3D"12G" >>=20 > >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. --=20 Peter Jeremy --3lcZGd9BuhuYXNfi Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQJ8BAEBCgBmBQJaOrI8XxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRFRUIyOTg2QzMwNjcxRTc0RTY1QzIyN0Ux NkE1OTdBMEU0QTIwQjM0AAoJEBall6Dkogs0SBgP/0QeT0gCgBGguJyeDjFsMkIz eMYBxLynUkDYMQPLwzdHIOAsHOEYLdz3ghq3SeXZg/QFv11fFNsiKUvS/GAx6Xye YrL59imyOucjNMYqFZ6GEKlExBGp7Cnshis7LMNc6DdvKeDxiabHckrEYwEybaNy a38IPqmqc2s7gbtN+p/H6OsqVlVnOhd0oENPsFwiso8pHMaRlD89cqyHSC7+k5F3 Bzr1/b1Aao/WmlHrNLBP8Z52jG5YJ0yiSYTAsFHqG5TkPms9x/EgDkt2PRw2I0ny SPI6DDHZSX+hG00zw5u9HWNN2mnUvgyKgUB1XptZWcK47vVBQFggb6uETM2/UaZp MBmtwbLUheSCrEKEciVL6Sr8PZLcCDHuttP6Jw2APZZXhK2UcAFUhM0X7koAO0Kk bUmF2oLSUPFjtizQpfOutWE0MsSwfcmAYoHD5REhXhPKeEF6i/B2be6G7gTfB0t9 7jpQLlM/LBjy+KB7bRF/mliASWKIu7F658cBGgSzW28yX7/4wiBr8YnzmCIPLgVP 7mnbatcVbdhKQnoOZe01isDGah/7uuiH1janIEKTSjZYTsW9r/bRb3Fb6le0w1Be qcYtGTnH48ZrEfu8cGmoxOivWvRrjKnyBYjju9OSVUUjZDVBd8x5LVKxPQyi8pIH kRc+khIsxhAcQvYAUvQD =QTeW -----END PGP SIGNATURE----- --3lcZGd9BuhuYXNfi--
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