linux-ext4 - Re: Question on block group allocation

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Message-ID: <6601abe90905040852w3846b3bened28369dd4ce6f49@mail.gmail.com>
Date:	Mon, 4 May 2009 08:52:05 -0700
From:	Curt Wohlgemuth <curtw@...gle.com>
To:	Theodore Tso <tytso@....edu>
Cc:	Andreas Dilger <adilger@....com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Question on block group allocation

Hi Ted:

On Wed, Apr 29, 2009 at 2:20 PM, Theodore Tso <tytso@....edu> wrote:
> 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.

Although it might seem like I've been ignoring this request, in fact
I'm having trouble recreating the problem now.  Both the "three dd"
commands above, and the performance problem I was seeing in the
original posting seem to have mysteriously disappeared.  I'll keep
trying and let the list know what I find.

Thanks,
Curt

>
> Thanks,
>
>                                                - Ted
>
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