linux-ext4 - Re: Question on block group allocation

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Message-ID: <20090427224052.GC22104@mit.edu>
Date:	Mon, 27 Apr 2009 18:40:52 -0400
From:	Theodore Tso <tytso@....edu>
To:	Curt Wohlgemuth <curtw@...gle.com>, G@....edu
Cc:	Andreas Dilger <adilger@....com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Question on block group allocation

On Sun, Apr 26, 2009 at 11:29:39PM -0600, Curt Wohlgemuth wrote:
> The random read throughput on the 10GB file went from ~16 MB/s to ~22
> MB/s after Andreas' patch; the total fragmentation of the file was
> much lower than before his patch.
> 
> However, the number of extents went up by quite a bit (I don't have
> the debugfs output in front of me at the moment, sorry).  

I'm curious what you meant by the combination of these two statements,
"the total fragmentation of the file was much lower than before his
patch", and "the number of extents went up by quite a bit".  Can you
send me the debugfs output when you have a chance?

Thanks,

						- Ted
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