linux-ext4 - Re: Question on block group allocation

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Message-ID: <20090429212043.GB24749@mit.edu>
Date:	Wed, 29 Apr 2009 17:20:43 -0400
From:	Theodore Tso <tytso@....edu>
To:	Curt Wohlgemuth <curtw@...gle.com>
Cc:	Andreas Dilger <adilger@....com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Question on block group allocation

On Wed, Apr 29, 2009 at 01:21:09PM -0700, Curt Wohlgemuth wrote:
> 
> Hmm, I thought I attached the output from "e2fsck -E fragcheck"; yes,
> I did: one simple line:
> 
>         /dev/hdm3: clean, 14/45760512 files, 7608255/183010471 blocks

Sorry, I should have been more explicit.   You need to do

"e2fsck -f -E fragcheck", and you will get a *heck* of a lot more than
a single line.  :-)

> And actually, I created the files sequentially:
> 
> dd if=/dev/zero of=$MNT_PT/4g bs=1G count=4
> dd if=/dev/zero of=$MNT_PT/4g-2 bs=1G count=4
> dd if=/dev/zero of=$MNT_PT/10g bs=1G count=10

Really?  Hmm, I wouldn't have expected that.  So now I'd really love
to see the fragcheck results (both with and without the patch), and/or
the results of debugfs stat'ing all three files, both with and without
the patch.

Thanks,

						- Ted
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