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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Jeff Moyer <jmoyer@redhat.com>
Cc: kosaki.motohiro@jp.fujitsu.com, linux-kernel@vger.kernel.org,
	linux-ext4@vger.kernel.org, jens.axboe@oracle.com,
	vgoyal@redhat.com
Subject: Re: [PATCH 0/4 v4] ext3/4: enhance fsync performance when using CFQ
Date: Wed, 19 May 2010 11:05:20 +0900 (JST)	[thread overview]
Message-ID: <20100519105706.8821.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <1274206820-17071-1-git-send-email-jmoyer@redhat.com>

Hi Jeff,

> This patch series addresses a performance problem experienced when running
> io_zone with small file sizes (from 4KB up to 8MB) and including fsync in
> the timings.  A good example of this would be the following command line:
>   iozone -s 64 -e -f /mnt/test/iozone.0 -i 0
> As the file sizes get larger, the performance improves.  By the time the
> file size is 16MB, there is no difference in performance between runs
> using CFQ and runs using deadline.  The storage in my testing was a NetApp
> array connected via a single fibre channel link.  When testing against a
> single SATA disk, the performance difference is not apparent.

offtopic:

Can this patch help to reduce a pain of following much small files issue?

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=578635

Now, userland folks think sync() is faster than fsync() on ext4. I don't 
hope spread this unrecommended habit widely.




  parent reply	other threads:[~2010-05-19  2:05 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-05-18 18:20 Jeff Moyer
2010-05-18 18:20 ` [PATCH 1/4] cfq-iosched: Keep track of average think time for the sync-noidle workload Jeff Moyer
2010-05-18 20:52   ` Vivek Goyal
2010-05-18 21:02   ` Vivek Goyal
2010-06-01 19:31     ` Jeff Moyer
2010-05-18 18:20 ` [PATCH 2/4] block: Implement a blk_yield function to voluntarily give up the I/O scheduler Jeff Moyer
2010-05-18 21:07   ` Vivek Goyal
2010-05-18 21:44   ` Vivek Goyal
2010-06-01 20:01     ` Jeff Moyer
2010-05-18 18:20 ` [PATCH 3/4] jbd: yield the device queue when waiting for commits Jeff Moyer
2010-05-18 18:20 ` [PATCH 4/4] jbd2: yield the device queue when waiting for journal commits Jeff Moyer
2010-05-19  2:05 ` KOSAKI Motohiro [this message]
2010-05-26 15:33   ` [PATCH 0/4 v4] ext3/4: enhance fsync performance when using CFQ Jeff Moyer

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