Message-ID: <490754F1.1080607@cfl.rr.com>
Date: Tue, 28 Oct 2008 14:07:45 -0400
From: Phillip Susi <psusi@cfl.rr.com>
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To: Thomas Guyot-Sionnest <dermoth@aei.ca>
CC: linux-kernel@vger.kernel.org
Subject: Re: CFQ Idle class slowing down everything?
References: <gcm0sv$ra4$1@ger.gmane.org> <20081014121859.4778abcf.akpm@linux-foundation.org> <490226C9.4000406@aei.ca>
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Thomas Guyot-Sionnest wrote:
> On 14/10/08 03:18 PM, Andrew Morton wrote:
>>> When "idle", the slave do mostly random writes: about 15 rtps and 200
>>> wtps. For testing I ended up running dd to read files from disk to
>>> /dev/null while avoiding the system cache (had 42GB of data to read

Just thought I would point out that dd is, in fact, dirtying the buffer 
cache since you don't pass flag=direct.

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