From: Joel Becker Subject: Re: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using CFQ Date: Tue, 22 Jun 2010 15:13:07 -0700 Message-ID: <20100622221306.GA20090@mail.oracle.com> References: <1277242502-9047-1-git-send-email-jmoyer@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: axboe@kernel.dk, vgoyal@redhat.com, linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org To: Jeff Moyer Return-path: Received: from rcsinet10.oracle.com ([148.87.113.121]:20148 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751528Ab0FVWOv (ORCPT ); Tue, 22 Jun 2010 18:14:51 -0400 Content-Disposition: inline In-Reply-To: <1277242502-9047-1-git-send-email-jmoyer@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: 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@oracle.com Phone: (650) 506-8127