From: Lukas Hejtmanek <xhejtman@ics.muni.cz>
To: Zan Lynx <zlynx@acm.org>
Cc: Prakash Punnoor <prakash@punnoor.de>,
Jan Engelhardt <jengelh@computergmbh.de>,
linux-kernel@vger.kernel.org
Subject: Re: Disk schedulers
Date: Sat, 16 Feb 2008 17:13:10 +0100 [thread overview]
Message-ID: <20080216161310.GG4269@ics.muni.cz> (raw)
In-Reply-To: <1203095486.6663.12.camel@localhost>
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
next prev parent reply other threads:[~2008-02-16 16:13 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-14 16:21 Lukas Hejtmanek
2008-02-15 0:02 ` Tejun Heo
2008-02-15 10:09 ` Lukas Hejtmanek
2008-02-15 14:42 ` Jan Engelhardt
2008-02-15 14:57 ` Prakash Punnoor
2008-02-15 17:11 ` Zan Lynx
2008-02-15 21:32 ` FD Cami
2008-02-16 16:13 ` Lukas Hejtmanek [this message]
2008-02-20 17:04 ` Zdenek Kabelac
2008-02-15 15:59 ` Lukas Hejtmanek
2008-02-15 16:22 ` Jeffrey E. Hundstad
2008-02-15 17:36 ` Roger Heflin
2008-02-15 17:24 ` Paulo Marques
2008-02-16 16:15 ` Lukas Hejtmanek
2008-02-16 17:20 ` Pavel Machek
2008-02-20 18:48 ` Lukas Hejtmanek
2008-02-21 23:50 ` Giuliano Pochini
2008-02-17 19:38 ` Linda Walsh
2008-02-28 17:14 ` Bill Davidsen
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