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From: Stefan Ring <stefanrin@gmail.com>
To: stan@hardwarefreak.com
Cc: Linux fs XFS <xfs@oss.sgi.com>
Subject: Re: A little RAID experiment
Date: Thu, 31 May 2012 08:44:53 +0200	[thread overview]
Message-ID: <CAAxjCExy835uQCrD+E9zq=dEm-on5=+DZ1UeeBDn6VXMGWaM_g@mail.gmail.com> (raw)
In-Reply-To: <4FC6C9AE.1070808@hardwarefreak.com>

> You now have persistent write cache.  Did you test with XFS barriers
> disabled?  If not you should.  You'll likely see a decent, possibly
> outstanding, performance improvement with your huge metadata
> modification workload, as XFS will no longer flush the cache frequently
> when writing to the journal log.

I've already done that test with the previous controller. It had a
BBWC, so it was persistent as well. And it was easy to enable or
disable it. Yes, everything was always done with barrier=0. And yes,
the cache made a big difference (about 3x).

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  reply	other threads:[~2012-05-31  6:44 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-25  8:07 A little RAID experiment Stefan Ring
2012-04-25 14:17 ` Roger Willcocks
2012-04-25 16:23   ` Stefan Ring
2012-04-27 14:03     ` Stan Hoeppner
2012-04-26  8:53   ` Stefan Ring
2012-04-27 15:10     ` Stan Hoeppner
2012-04-27 15:28     ` Joe Landman
2012-04-28  4:42       ` Stan Hoeppner
2012-04-27 13:50 ` Stan Hoeppner
2012-05-01 10:46   ` Stefan Ring
2012-05-30 11:07     ` Stefan Ring
2012-05-31  1:30       ` Stan Hoeppner
2012-05-31  6:44         ` Stefan Ring [this message]
2012-07-16 19:57 ` Stefan Ring
2012-07-16 20:03   ` Stefan Ring
2012-07-16 20:05     ` Stefan Ring
2012-07-16 21:27   ` Stan Hoeppner
2012-07-16 21:58     ` Stefan Ring
2012-07-17  1:39       ` Stan Hoeppner
2012-07-17  5:26         ` Dave Chinner
2012-07-18  2:18           ` Stan Hoeppner
2012-07-18  6:44             ` Stefan Ring
2012-07-18  7:09               ` Stan Hoeppner
2012-07-18  7:22                 ` Stefan Ring
2012-07-18 10:24                   ` Stan Hoeppner
2012-07-18 12:32                     ` Stefan Ring
2012-07-18 12:37                       ` Stefan Ring
2012-07-19  3:08                         ` Stan Hoeppner
2012-07-25  9:29                           ` Stefan Ring
2012-07-25 10:00                             ` Stan Hoeppner
2012-07-25 10:08                               ` Stefan Ring
2012-07-25 11:00                                 ` Stan Hoeppner
2012-07-26  8:32                             ` Dave Chinner
2012-09-11 16:37                               ` Stefan Ring
2012-07-16 22:16     ` Stefan Ring
2012-10-10 14:57 ` Stefan Ring
2012-10-10 21:27   ` Dave Chinner
2012-10-10 22:01     ` Stefan Ring
2012-04-26 22:33 Richard Scobie
2012-04-27 21:30 ` Emmanuel Florac
2012-04-28  4:15   ` Richard Scobie

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