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Re: XFS + SMP + Software RAID 5 slow?

To: linux-xfs@xxxxxxxxxxx
Subject: Re: XFS + SMP + Software RAID 5 slow?
From: Andrew Klaassen <ak@xxxxxxx>
Date: Fri, 31 Oct 2003 18:26:49 -0500
In-reply-to: <20031031231943.GE25822@xxxxxxx>
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Annnnnnd... responding to myself yet again.  (Have I overflowed
some sort of netiquette stack yet?)

BTW, I'm not subscribed, but I am monitoring the web archive for
responses.  Still, CC'ing me with responses would be great. ;)

On Fri, Oct 31, 2003 at 06:19:43PM -0500,
Andrew Klaassen wrote:

> Responding to myself again, with more details...
> 
> On Fri, Oct 31, 2003 at 04:50:13PM -0500,
> Andrew Klaassen wrote:
> 
> > I've been experiencing *very* slow sustained write ( < .5MB/sec)
> > using 2.4.20-20.9.XFS1.3.1smp on a dual-Xeon box with a 3ware
> > 7506 card in JBOD mode.  Software RAID 5.  No such problems with
> > Ext3 ( > 20MB/sec sustained write) with the same kernel on the
> > same software RAID 5 device.
> 
> I got those results using fs-bench:
> 
> http://h2np.net/tools/fs-bench.tar.gz

I notice that fs-bench works by filling the filesystem with
bazillions and bazillions of ~100KB files.  Would that have an
impact on XFS performance?

Andrew Klaassen


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