linux-ext4 - Re: ext4

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Date:	Mon, 2 Jul 2012 11:03:11 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Ric Wheeler <rwheeler@...hat.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Theodore Ts'o <tytso@....edu>, Fredrick <fjohnber@...o.com>,
	linux-ext4@...r.kernel.org, wenqing.lz@...bao.com
Subject: Re: ext4_fallocate

On Fri, Jun 29, 2012 at 01:02:35PM -0600, Andreas Dilger wrote:
> There is already code for this in the ext4 uninit extent handling.
> Currently the limit is 15(?) blocks, to inflate the write size up
> to zero-fill a 64kB chunk on 4kB blocksize filesystems.  I wouldn't
> object to increasing this to zero out a full 1MB (aligned) chunk
> under random IO cases.

I agree with you that we can increase it to 1MB chunk, and I will run
some tests to see the result.  In addition, I am thinking whether we can
provide a parameter in sysfs or some other places to adjust this value
dynamically.

Regards,
Zheng
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