linux-ext4 - Re: [PATCH 2/4] Create the journal in the middle of the filesystem

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Date:	Thu, 28 Aug 2008 10:38:39 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Theodore Tso <tytso@....edu>
CC:	Frédéric Bohé <frederic.bohe@...l.net>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/4] Create the journal in the middle of the filesystem

Theodore Tso wrote:
> On Thu, Aug 28, 2008 at 09:40:30AM -0400, Ric Wheeler wrote:
>   
>> I can try and test this with my fsync() heavy fs_mark run...
>>
>>     
>
> Given [1] I have no doubt that you should see a difference between
> mke2fs from e2fsprogs 1.41.0 (which will allocate the journal at the
> beginning of the filesystem) and the latest tip of e2fsprogs.
>
> It would be interesting to see how measurable the difference is,
> though.  I'd recommend doing "mke2fs -t ext4dev" using both versions
> of mke2fs, and seeing how much the difference it makes.
>
> [1] http://www.usenix.org/events/usenix05/tech/general/full_papers/prabhakaran/prabhakaran_html/main.html#fig-journal-location-withinfs-fix
>
> 							- Ted
>
>   

I was thinking of trying this on a much larger disk (1TB) - the article 
reports on a 4GB partition which is pretty tiny,

ric

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