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Date:	Thu, 17 Jan 2008 07:47:54 -0500
From:	"Abhishek Rai" <>
To:	"Theodore Tso" <>,
	"Christoph Hellwig" <>,
	"Andrew Morton" <>,
	"Abhishek Rai" <>,,,
Subject: Re: [CALL FOR TESTING] Make Ext3 fsck way faster [2.6.24-rc6 -mm patch]

On Jan 15, 2008 10:28 AM, Theodore Tso <> wrote:
> Also, it's not just reducing fsck times, although that's the main one.
> The last time this was suggested, the rationale was to speed up the
> "rm dvd.iso" case.  Also, something which *could* be done, if Abhishek
> wants to pursue it, would be to pull in all of the indirect blocks
> when the file is opened, and create an in-memory extent tree that
> would speed up access to the file.  It's rarely worth doing this
> without metaclustering, since it doesn't help for sequential I/O, only
> random I/O, but with metaclustering it would also be a win for
> sequential I/O.  (This would also remove the minor performance
> degradation for sequential I/O imposed by metaclustering, and in fact
> improve it slightly for really big files.)
>                                         - Ted

Also, since the in memory extent tree will now occupy much less space,
we can keep them cached for a much longer time which will improve
performance of random reads. The new metaclustering patch is more
amenable to this trick since it reduces fragmentation thereby reducing
the number of extents.

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