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

Arjan van de Ven
2009-09-20T06:07:21Z

On Sun, 20 Sep 2009 05:08:43 +0200
Ulrich Lukas <stellplatz-nr.13a@datenparkplatz.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.