From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff Garzik <jeff@garzik.org>
Subject: Re: [RFC 0/13] extents and 48bit ext3
Date: Sat, 10 Jun 2006 11:03:14 -0400
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Cc: Andrew Morton <akpm@osdl.org>,
	ext2-devel <ext2-devel@lists.sourceforge.net>,
	linux-kernel@vger.kernel.org, Adrian Bunk <bunk@stusta.de>,
	Linus Torvalds <torvalds@osdl.org>, Gerrit Huizenga <gh@us.ibm.com>,
	cmm@us.ibm.com, linux-fsdevel@vger.kernel.org,
	Alex Tomas <alex@clusterfs.com>,
	Andreas Dilger <adilger@clusterfs.com>
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To: Ingo Molnar <mingo@elte.hu>
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Ingo Molnar wrote:
> the ext3 -> ext4 patches add +2115 lines of code (which 2115 lines solve 
> the biggest performance and scaling problem ext3 currently has), which 
> is 1.9% of the linecount of XFS.

Indeed!


> ext3 does quite a few things to stay compatible with ext2 - and frankly, 
> i very much expected it to do that when i migrated my ext2 data to ext3. 
> The days of "change the world in an incompatible way and dont look back" 
> are gone.

I agree with your point in the thread -- most users and distros don't 
change their main fs on a whim.  But I also point out that these 
extent+48bit changes _do_ change the format in an incompatible way...

	Jeff