linux-ext4 - Re: Large File Deletion Comparison (ext3, ext4, XFS)

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Date:	Fri, 27 Apr 2007 14:33:46 -0400
From:	Theodore Tso <tytso@....edu>
To:	Valerie Clement <valerie.clement@...l.net>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Large File Deletion Comparison (ext3, ext4, XFS)

On Fri, Apr 27, 2007 at 03:41:19PM +0200, Valerie Clement wrote:
> As asked by Alex, I included in the test results the file fragmentation 
> level and the number of I/Os done during the file deletion.
> 
> Here are the results obtained with a not very fragmented 100-GB file:
> 
>                  |     ext3       ext4 + extents      xfs
> ------------------------------------------------------------
>  nb of fragments |     796             798             15
>  elapsed time    |  2m0.306s        0m11.127s       0m0.553s
>                  |
>  blks read       |  206600            6416            352
>  blks written    |   13592           13064            104
> ------------------------------------------------------------

The metablockgroups feature should help the file fragmentation level
with extents.  It's easy enough to enable this for ext4 (we just need
to remove some checks in ext4_check_descriptors), so we should just do
it.

						- Ted
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