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Re: High latencies writing to a memory mapped file

To: Matthias Schniedermeyer <ms@xxxxxxx>
Subject: Re: High latencies writing to a memory mapped file
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Tue, 27 Jul 2010 12:47:50 +0200
Cc: Shawn Bohrer <shawn.bohrer@xxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20100727092452.GA23307@xxxxxxx>
Organization: Intellique
References: <20100722144706.GA2840@xxxxxxxxxxxxxxxxxxxxxxxxx> <20100727092452.GA23307@xxxxxxx>
Le Tue, 27 Jul 2010 11:24:52 +0200
Matthias Schniedermeyer <ms@xxxxxxx> écrivait:

> In case anybody has an idea what i could do to identify and/or
> isolate the root-cause, i'm open for suggestions.
> 

I'd thought that the io scheduler is the culprit. I've generally found
that the default CFQ scheduler (default) is terrible for file servers.

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