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Date:	Fri, 26 Oct 2007 22:08:47 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Andreas Dilger <adilger@....com>
CC:	ext4 development <linux-ext4@...r.kernel.org>,
	Alex Tomas <alex.tomas@....com>
Subject: Re: delalloc fragmenting files?

Eric Sandeen wrote:

> but not yet O_DIRECT, will do.


dd if=/dev/zero oflag=direct of=/mnt/test/foobar bs=1024k count=8192

filefrag -v /mnt/test/foobar  | grep -i extents
File is stored in extents format
/mnt/test/foobar: 67 extents found


http://people.redhat.com/esandeen/seekwatcher/ext4-dd-write-odirect.png

-Eric
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