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Re: Latencies in XFS.

To: Andrew Clayton <andrew@xxxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Subject: Re: Latencies in XFS.
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Sat, 13 Oct 2007 20:10:15 +0200
In-reply-to: <20071009163635.413dec0c@xxxxxxxxxxxxxx>
Organization: Intellique
References: <20071009163635.413dec0c@xxxxxxxxxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx
Le Tue, 9 Oct 2007 16:36:35 +0100 vous écriviez:

> I think I have narrowed it down to XFS.

I notice you use a bleeding-edge unstable kernel, with a whole new
scheduler. I tried your benchmark on a machine running a known stable
kernel (2.6.20.17) and the slowdown is similar in xfs and other fs.

As a side note, I personnally wouldn't choose xfs for desktop users home
directories (email,web, etc) because it's much better at pure
throughput and quite slower at IOPS than other FSes. Reiserfs is the
best of the common FSes for this.

I'm quite surprised that apparently your production system is running
a prerelease kernel. Why? 

-- 
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Emmanuel Florac               www.intellique.com   
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