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

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Date:	Thu, 24 Jun 2010 13:54:30 +0800
From:	Tao Ma <tao.ma@...cle.com>
To:	Tao Ma <tao.ma@...cle.com>
CC:	Jeff Moyer <jmoyer@...hat.com>, axboe@...nel.dk, vgoyal@...hat.com,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	Joel Becker <joel.becker@...cle.com>,
	Sunil Mushran <sunil.mushran@...cle.com>,
	"ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>
Subject: Re: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using
 CFQ

Hi Jeff,

On 06/23/2010 05:30 PM, Tao Ma wrote:
> Hi Jeff,
>
> On 06/23/2010 05:34 AM, Jeff Moyer wrote:
>> Hi,
>>
>> 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
>>
>> When run using the deadline I/O scheduler, an average of the first 5
>> numbers
>> will give you 448.4 files / second. CFQ will yield only 106.7. With
>> this patch series applied (and the two patches I sent yesterday), CFQ now
>> achieves 462.5 files / second.
> which 2 patches? Could you paste the link or the subject? Just want to
> make my test env like yours. ;)
> As Joel mentioned in another mail, ocfs2 also use jbd/jbd2, so I'd like
> to give it a try and give you some feedback about the test.
I am sorry to say that the patch make jbd2 locked up when I tested 
fs_mark using ocfs2.
I have attached the log from my netconsole server. After I reverted the 
patch [3/3], the box works again.

Regards,
Tao

View attachment "lockup.log" of type "text/x-log" (4430 bytes)