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Message-ID: <20120702031611.GB2406@gmail.com> Date: Mon, 2 Jul 2012 11:16:11 +0800 From: Zheng Liu <gnehzuil.liu@...il.com> To: Eric Sandeen <sandeen@...hat.com> Cc: Theodore Ts'o <tytso@....edu>, Fredrick <fjohnber@...o.com>, Ric Wheeler <rwheeler@...hat.com>, linux-ext4@...r.kernel.org, Andreas Dilger <adilger@...ger.ca>, wenqing.lz@...bao.com Subject: Re: ext4_fallocate On Wed, Jun 27, 2012 at 07:02:45PM -0400, Eric Sandeen wrote: > On 6/27/12 3:30 PM, Theodore Ts'o wrote: > > A better workload would be to use a blocksize of 4k. By using a > > blocksize of 1024k, it's not surprising that the metadata overhead is > > in the noise. > > > > Try something like this; this will cause the extent tree overhead to > > be roughly equal to the data block I/O. > > > > [global] > > rw=randwrite > > size=128m > > filesize=1g > > bs=4k > > ioengine=sync > > fallocate=1 > > fsync=1 > > > > [thread1] > > filename=testfile Hi Eric, Could you please run this test with 'journal_async_commit' flag. In my previous test, this feature can dramatically improve the performance of uninitialized extent conversion. I have sent an email to do a similar test [1]. In that email, I do a similar test and the journal_async_commit flag quite can improve the performance. 1. http://comments.gmane.org/gmane.linux.file-systems/63569 Regards, Zheng -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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