linux-ext4 - Re: [PATCH 01/11 RESEND] libe2p: Add new function get_fragment

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Message-ID: <BANLkTimZ1fhzgZiqe0Zamyt1yTV5LrHKFA@mail.gmail.com>
Date:	Sat, 18 Jun 2011 13:00:54 -0400
From:	Greg Freemyer <greg.freemyer@...il.com>
To:	Andreas Dilger <aedilger@...il.com>
Cc:	Eric Sandeen <sandeen@...hat.com>, "Ted Ts'o" <tytso@....edu>,
	Kazuya Mio <k-mio@...jp.nec.com>,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 01/11 RESEND] libe2p: Add new function get_fragment_score()

On Sat, Jun 18, 2011 at 3:19 AM, Andreas Dilger <aedilger@...il.com> wrote:
> I was thinking about this, and am wondering if it makes sense to have an absolute score for fragmentation instead of a relative one?
>
> By absolute I mean something like fragments per MB or similar. A bad score might be anything > 1. For files smaller than 1 MB in size it would scale the ratio to the equivalent if the file was 1MB in size (e.g. a 16kB file with 4 fragments would have a score of 256, which is clearly bad).  Large files can have a score much less than 1, which is good.
>
> Cheers, Andreas

Shouldn't be based on fragments per max extent size for ext4?

And I think the max extent size for a 4KB page is 128 MB, right?

Greg
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