linux-ext4 - Re: A doubt on journal_async

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Message-ID: <548E59E2.3080001@huawei.com>
Date:	Mon, 15 Dec 2014 11:47:46 +0800
From:	alex chen <alex.chen@...wei.com>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	Jan Kara <jack@...e.cz>, <linux-ext4@...r.kernel.org>,
	Joseph Qi <joseph.qi@...wei.com>
Subject: Re: A doubt on journal_async_commit option

On 2014/12/12 22:54, Theodore Ts'o wrote:
> On Fri, Dec 12, 2014 at 02:03:32PM +0800, alex chen wrote:
>> This commit 0e3d2a6313(ext4: Fix async commit mode to be safe by using
>> a barrier) show that using journal_async_commit feature has a 50%
>> performance improvement. But I tested in SUSE Linux Enterprise Server
>> 11 SP3(linux kernel 3.0.93) and Red Hat Enterprise linux 6.4(linux
>> kernel 2.6.32), the result show this feature has no performance
>> improvement.
>> My test command:
>> mount /dev/sdb /mnt/sdb
>> ./fs_mark  -d  /mnt/sdb/  -s  10240  -n  1000
>> umount
>>
>> mount /dev/sdb /mnt/sdb -o journal_async_commit
>> ./fs_mark  -d  /mnt/sdb/  -s  10240  -n  1000
>> umount
>>
>> My test result:
>> FSUse%        Count         Size    Files/sec     App Overhead
>>      6         1000        10240         42.1            10671
>> vs.
>> -o journal_async_commit
>> FSUse%        Count         Size    Files/sec     App Overhead
>>      6         1000        10240         63.9            10625
> 
> Um, the files per second went up from 42.1 to 63.9 --- that's a 50%
> improvement, yes?
> 
> 							- Ted
Yes, I understand it. Thank you!

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