linux-kernel - Re: filesystem benchmarking fun

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Date:	Wed, 16 May 2007 20:12:09 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Chris Mason <chris.mason@...cle.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: filesystem benchmarking fun


On May 16 2007 10:42, Chris Mason wrote:
>
>For example, I'll pick on xfs for a minute.  compilebench shows the
>default FS you get from mkfs.xfs is pretty slow for untarring a bunch of
>kernel trees.

I suppose you used 'nobarrier'? [ http://lkml.org/lkml/2006/5/19/33 ]

>Dave Chinner gave me some mount options that make it
>dramatically better,

and `mkfs.xfs -l version=2` is also said to make it better

>but it still writes at 10MB/s on a sata drive that
>can do 80MB/s.  Ext3 is better, but still only 20MB/s. 
>
>Both are presumably picking a reasonable file and directory layout.
>Still, our writeback algorithms are clearly not optimized for this kind
>of workload.  Should we fix it?

Also try with tmpfs.



	Jan
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