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From: Zheng Liu <gnehzuil.liu@gmail.com>
To: Eric Sandeen <sandeen@redhat.com>
Cc: Theodore Ts'o <tytso@mit.edu>, Fredrick <fjohnber@zoho.com>,
	Ric Wheeler <rwheeler@redhat.com>,
	linux-ext4@vger.kernel.org, Andreas Dilger <adilger@dilger.ca>,
	wenqing.lz@taobao.com
Subject: Re: ext4_fallocate
Date: Mon, 2 Jul 2012 11:16:11 +0800	[thread overview]
Message-ID: <20120702031611.GB2406@gmail.com> (raw)
In-Reply-To: <4FEB9115.6090309@redhat.com>

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

  parent reply	other threads:[~2012-07-02  3:07 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-25  6:42 ext4_fallocate Fredrick
2012-06-25  7:33 ` ext4_fallocate Andreas Dilger
2012-06-28 15:12   ` ext4_fallocate Phillip Susi
2012-06-28 15:23     ` ext4_fallocate Eric Sandeen
2012-06-25  8:51 ` ext4_fallocate Zheng Liu
2012-06-25 19:04   ` ext4_fallocate Fredrick
2012-06-25 19:17   ` ext4_fallocate Theodore Ts'o
2012-06-26  1:23     ` ext4_fallocate Fredrick
2012-06-26 13:13     ` ext4_fallocate Ric Wheeler
2012-06-26 17:30       ` ext4_fallocate Theodore Ts'o
2012-06-26 18:06         ` ext4_fallocate Fredrick
2012-06-26 18:21         ` ext4_fallocate Ric Wheeler
2012-06-26 18:57           ` ext4_fallocate Ted Ts'o
2012-06-26 19:22             ` ext4_fallocate Ric Wheeler
2012-06-26 18:05       ` ext4_fallocate Fredrick
2012-06-26 18:59         ` ext4_fallocate Ted Ts'o
2012-06-26 19:30         ` ext4_fallocate Ric Wheeler
2012-06-26 19:57           ` ext4_fallocate Eric Sandeen
2012-06-26 20:44             ` ext4_fallocate Eric Sandeen
2012-06-27 15:14               ` ext4_fallocate Eric Sandeen
2012-06-27 19:30               ` ext4_fallocate Theodore Ts'o
2012-06-27 23:02                 ` ext4_fallocate Eric Sandeen
2012-06-28 11:27                   ` ext4_fallocate Ric Wheeler
2012-06-29 19:02                     ` ext4_fallocate Andreas Dilger
2012-07-02  3:03                       ` ext4_fallocate Zheng Liu
2012-06-28 12:48                   ` ext4_fallocate Theodore Ts'o
2012-07-02  3:16                   ` Zheng Liu [this message]
2012-07-02 16:33                     ` ext4_fallocate Eric Sandeen
2012-07-02 17:44                       ` ext4_fallocate Jan Kara
2012-07-02 17:48                         ` ext4_fallocate Ric Wheeler
2012-07-03 17:41                           ` ext4_fallocate Zheng Liu
2012-07-03 17:57                             ` ext4_fallocate Zach Brown
2012-07-04  2:23                               ` ext4_fallocate Zheng Liu
2012-07-02 18:01                         ` ext4_fallocate Theodore Ts'o
2012-07-03  9:30                           ` ext4_fallocate Jan Kara
2012-07-04  1:15                         ` ext4_fallocate Phillip Susi
2012-07-04  2:36                           ` ext4_fallocate Zheng Liu
2012-07-04  3:06                             ` ext4_fallocate Phillip Susi
2012-07-04  3:48                               ` ext4_fallocate Zheng Liu
2012-07-04 12:20                               ` ext4_fallocate Ric Wheeler
2012-07-04 13:25                                 ` ext4_fallocate Zheng Liu
2012-06-26 13:06 ` ext4_fallocate Eric Sandeen

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