linux-kernel - Re: Poor desktop responsiveness with background I/O-operations

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Message-ID: <20090920080728.73bfe2a1@infradead.org>
Date:	Sun, 20 Sep 2009 08:07:28 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Poor desktop responsiveness with background I/O-operations

On Sun, 20 Sep 2009 05:08:43 +0200
Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de> wrote:
> 
> Observation:
> - The system becomes _really_ slow as described above; unusable for
>   any multimedia tasks.
> 
> - Using an encrypted (dm-crypt/LUKS) /home (e.g. on mobile computers)
>   compounds the issue to a painful extent.
> 
> 
> 
> Possible culprits (I'm guessing) are the Linux I/O- or CPU scheduler.

this has nothing to do with the cpu scheduler.... 
can you try the following two things?

echo 4096 > /sys/block/sda/queue/nr_requests
for i in `pidof kjournald` ; do ionice -c1 -p $i ; done

to see if they help?

they tweak the IO scheduler... I assume you're using CFQ.
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