linux-kernel - Re: Disk schedulers

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Message-ID: <20080216161310.GG4269@ics.muni.cz>
Date:	Sat, 16 Feb 2008 17:13:10 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Zan Lynx <zlynx@....org>
Cc:	Prakash Punnoor <prakash@...noor.de>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Disk schedulers

On Fri, Feb 15, 2008 at 10:11:26AM -0700, Zan Lynx wrote:
> Yes, I see this often myself.  It's like the disk IO queue (I set mine
> to 1024) fills up, and pdflush and friends can stuff write requests into
> it much more quickly than any other programs can provide read requests.
> 
> CFQ and ionice work very well up until iostat shows average IO queuing
> above 1024 (where I set the queue number).

I though that CFQ would maintain IO queues per process and pick up request in
round robin from non-empty queues. Am I wrong? And if wrong, isn't it desired
behavior for desktop?

-- 
Lukáš Hejtmánek
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