From: Alex Tomas <alex@clusterfs.com>
Subject: Re: Ext4 devel interlock meeting minutes (April 23, 2007)
Date: Mon, 30 Apr 2007 15:13:47 +0400
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Cc: Avantika Mathur <mathur@linux.vnet.ibm.com>,
	linux-ext4@vger.kernel.org
To: Aneesh Kumar <aneesh.kumar@gmail.com>
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Aneesh Kumar wrote:
> What i am doing for creating a large number of extents is
> 
> dd if=/dev/zero of=myfile count=10
> seek=20
> while [ 1 ]; do dd if=/dev/zero of=myfile count=10 seek=$seek;
> seek=`expr $seek + 20`; done

with AGGRESSIVE_TEST defined in include/linux/ext4_fs_extents.h you may
get much more extents and index blocks.