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Date:	Mon, 2 Jul 2012 11:03:11 +0800
From:	Zheng Liu <>
To:	Andreas Dilger <>
Cc:	Ric Wheeler <>,
	Eric Sandeen <>,
	Theodore Ts'o <>, Fredrick <>,,
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

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