Date: Sat, 23 Jan 2010 19:52:41 +0100 From: Erwin Lansing <erwin@FreeBSD.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: freebsd-stable@FreeBSD.org, Jeremy Chadwick <freebsd@jdc.parodius.com> Subject: Re: ZFS performance degradation over time Message-ID: <20100123185241.GI23919@droso.net> In-Reply-To: <20100120114730.916917ef0eu668n4@webmail.leidinger.net> References: <7346c5c61001030842r7dc76199y51e4c1c90a3eea6e@mail.gmail.com> <7346c5c61001091706m45a3a2a5k3ca8bb0c4bec5ea8@mail.gmail.com> <7346c5c61001171521w1ca4738w98e8fcca24643cda@mail.gmail.com> <201001180829.48126.npapke@acm.org> <7346c5c61001190840k31466754i32b2ae833390b79b@mail.gmail.com> <20100119170101.GA80917@icarus.home.lan> <20100120114730.916917ef0eu668n4@webmail.leidinger.net>
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--kRPgt2ku+S/0Bic/ Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jan 20, 2010 at 11:47:30AM +0100, Alexander Leidinger wrote: >=20 > Quoting Jeremy Chadwick <freebsd@jdc.parodius.com> (from Tue, 19 Jan =20 > 2010 09:01:01 -0800): >=20 > > I've two recommendations: > > > > 1) Have you considered "upgrading" to RELENG_8 (e.g. 8.0-STABLE) instead > > of sticking with 8.0-RELEASE? There's been a recent MFC to RELENG_8 > > which pertain to ARC drainage. I'm referring to the commit labelled > > revision 1.22.2.2 (RELENG_8): > > > > http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/cddl/contrib/opensolaris/= uts/common/fs/zfs/arc.c >=20 > This patch can be merged stand-alone if necessary, no need to go to =20 > RELENG_8 if there are reservations. >=20 > The commit you refer to above is just doing this: limiting the arc =20 > more to the arc_max than it was the case before. >=20 > This patch is in 7-stable too (in case someone is interested). >=20 Two weeks ago, we started experiencing similar symptoms on the pointyhat package cluster. This was on 9.0-CURRENT from last September. Upgrading to last weeks HEAD has solved the problem for us. The system is heavily loaded both on CPU, memory and disk, and since the original patch was committed back in October, my guess is that it was this specific commit that solved the issue. I'd recommend people still experiencing this issue to upgrade to a system that includes this change, be it 8.0-STABLE or 7.2-STABLE after January 8, or manually merging it. Cheers, -erwin --=20 Erwin Lansing http://droso.org Prediction is very difficult especially about the future erwin@FreeBSD.org --kRPgt2ku+S/0Bic/ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iD8DBQFLW0V5qy9aWxUlaZARAiWEAJ92IWkbKKCVc7MBa+rMaehgmnFdKwCfY2MD qjIXh1+Ljf2vqF8nav+/CB0= =QlqM -----END PGP SIGNATURE----- --kRPgt2ku+S/0Bic/--
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