From: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
To: Chris Murphy <lists@colorremedies.com>
Cc: linux-raid Raid <linux-raid@vger.kernel.org>
Subject: Re: recommended way to add ssd cache to mdraid array
Date: Sat, 12 Jan 2013 13:06:19 +0100 (CET) [thread overview]
Message-ID: <2258826.8.1357992379424.JavaMail.root@zimbra> (raw)
In-Reply-To: <6FD79D70-01A4-4DC9-9494-157773CD0F11@colorremedies.com>
> Unlikely to make up the difference is the scheduler. Parallel fs's
> like XFS don't perform nearly as well with CFQ, so you should have a
> kernel parameter elevator=noop.
uh… how can the filesystem chosen be relevant to the disk elevator? CFQ will try to optimize access to reduce seeks and should be completely independent on the filesystem used on top. Also, if you really want to disable CFQ (which you shouldn't do on rotating rust, IMO), better use deadline (which is default on newer kernels).
Vennlige hilsener / Best regards
roy
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next prev parent reply other threads:[~2013-01-12 12:06 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-22 6:57 recommended way to add ssd cache to mdraid array Thomas Fjellstrom
2012-12-23 3:44 ` Thomas Fjellstrom
2013-01-09 18:41 ` Thomas Fjellstrom
2013-01-10 6:25 ` Chris Murphy
2013-01-10 10:49 ` Thomas Fjellstrom
2013-01-10 21:36 ` Chris Murphy
2013-01-11 0:18 ` Stan Hoeppner
2013-01-11 12:35 ` Thomas Fjellstrom
2013-01-11 12:48 ` Thomas Fjellstrom
2013-01-14 0:05 ` Tommy Apel Hansen
2013-01-14 8:58 ` Thomas Fjellstrom
2013-01-14 18:22 ` Thomas Fjellstrom
2013-01-14 19:45 ` Stan Hoeppner
2013-01-14 21:53 ` Thomas Fjellstrom
2013-01-14 22:51 ` Chris Murphy
2013-01-15 3:25 ` Thomas Fjellstrom
2013-01-15 1:50 ` Stan Hoeppner
2013-01-15 3:52 ` Thomas Fjellstrom
2013-01-15 8:38 ` Stan Hoeppner
2013-01-15 9:02 ` Tommy Apel
2013-01-15 11:19 ` Stan Hoeppner
2013-01-15 10:47 ` Tommy Apel
2013-01-16 5:31 ` Thomas Fjellstrom
2013-01-16 8:59 ` John Robinson
2013-01-16 21:29 ` Stan Hoeppner
2013-02-10 6:59 ` Thomas Fjellstrom
2013-01-16 22:06 ` Stan Hoeppner
2013-01-14 21:38 ` Tommy Apel Hansen
2013-01-14 21:47 ` Tommy Apel Hansen
2013-01-11 12:20 ` Thomas Fjellstrom
2013-01-11 17:39 ` Chris Murphy
2013-01-11 17:46 ` Chris Murphy
2013-01-11 18:52 ` Thomas Fjellstrom
2013-01-12 0:47 ` Phil Turmel
2013-01-12 3:56 ` Chris Murphy
2013-01-13 22:13 ` Phil Turmel
2013-01-13 23:20 ` Chris Murphy
2013-01-14 0:23 ` Phil Turmel
2013-01-14 3:58 ` Chris Murphy
2013-01-14 22:00 ` Thomas Fjellstrom
2013-01-11 18:51 ` Thomas Fjellstrom
2013-01-11 22:17 ` Stan Hoeppner
2013-01-12 2:44 ` Thomas Fjellstrom
2013-01-12 8:33 ` Stan Hoeppner
2013-01-12 14:44 ` Thomas Fjellstrom
2013-01-13 19:18 ` Chris Murphy
2013-01-14 9:06 ` Thomas Fjellstrom
2013-01-11 18:50 ` Stan Hoeppner
2013-01-12 2:45 ` Thomas Fjellstrom
2013-01-12 12:06 ` Roy Sigurd Karlsbakk [this message]
2013-01-12 14:14 ` Stan Hoeppner
2013-01-12 16:37 ` Roy Sigurd Karlsbakk
2013-01-10 13:13 ` Brad Campbell
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