[Ocfs2-devel] [PATCH] ocfs2: add a mount option journal_async_commit on ocfs2 filesystem

[alex chen]

On 2015/1/7 7:58, Andrew Morton wrote:
> On Thu, 25 Dec 2014 10:53:05 +0800 alex chen <alex.chen at huawei.com> wrote:
> 
>> Add a mount option to support JBD2 feature:
>> JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT. When this feature is opened,
>> journal commit block can be written to disk without waiting for
>> descriptor blocks, which can improve journal commit performance. This
>> option will enable 'journal_checksum' internally.
>>
>> Using the fs_mark benchmark, using journal_async_commit shows a 50%
>> improvement, the files per second go up from 215.2 to 317.5.
>>
>> test script:
>> fs_mark  -d  /mnt/ocfs2/  -s  10240  -n  1000
>>
>> default:
>> FSUse%        Count         Size    Files/sec     App Overhead
>>      0         1000        10240        215.2            17878
>>
>> with journal_async_commit option:
>> FSUse%        Count         Size    Files/sec     App Overhead
>>      0         1000        10240        317.5            17881
> 
> For some reason this patch is a bit mangled and I had to apply the
> first hunk by hand.
> 

Sorry for my mistake， I will send the new patch based on linux-next
kernel. Thanks.
Alex
>>  fs/ocfs2/ocfs2.h |  2 ++
>>  fs/ocfs2/super.c | 17 +++++++++++++++++
> 
> Documentation/filesystems/ocfs2.txt needs an update.
OK
> 
> 
> 
> .
>