linux-kernel - Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes?

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Message-id: <832C6227-BF34-43C2-8768-1308C00AB17F@sun.com>
Date:	Mon, 01 Mar 2010 01:39:18 -0700
From:	Andreas Dilger <adilger@....com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	tytso@....edu, Eric Sandeen <sandeen@...hat.com>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alan Piszcz <ap@...arrain.com>
Subject: Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes?

On 2010-02-28, at 07:55, Justin Piszcz wrote:
> === CREATE RAID-0 WITH 11 DISKS


Have you tried testing with "nice" numbers of disks in your RAID set  
(e.g. 8 disks for RAID-0, 9 for RAID-5, 10 for RAID-6)?  The mballoc  
code is really much better tuned for power-of-two sized allocations.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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