linux-kernel - Re: CFQ Idle class slowing down everything?

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Message-ID: <490754F1.1080607@cfl.rr.com>
Date:	Tue, 28 Oct 2008 14:07:45 -0400
From:	Phillip Susi <psusi@....rr.com>
To:	Thomas Guyot-Sionnest <dermoth@....ca>
CC:	linux-kernel@...r.kernel.org
Subject: Re: CFQ Idle class slowing down everything?

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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