Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3

[Jeff Garzik]

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


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