linux-ext4 - Re: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using CFQ

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Message-ID: <20100622221306.GA20090@mail.oracle.com>
Date:	Tue, 22 Jun 2010 15:13:07 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	axboe@...nel.dk, vgoyal@...hat.com, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when
 using CFQ

On Tue, Jun 22, 2010 at 05:34:59PM -0400, Jeff Moyer wrote:
> Running iozone with the fsync flag, or fs_mark, the performance of CFQ is
> far worse than that of deadline for enterprise class storage when dealing
> with file sizes of 8MB or less.  I used the following command line as a
> representative test case:
> 
>   fs_mark -S 1 -D 10000 -N 100000 -d /mnt/test/fs_mark -s 65536 -t 1 -w 4096 -F

	I'd be interested in how ocfs2 does, because we use jbd2 too.

Joel

-- 

Life's Little Instruction Book #139

	"Never deprive someone of hope; it might be all they have."

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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