On Saturday 21 July 2007 10:03:24 David Causse wrote:
> Atte André Jensen a écrit :
> > Hi
> >
> > I trying out ubuntu with ubuntustudio kernel. In debian I always set the
> > priority of the IRQ's using
> >
> > chrt -f -p 85 `pidof "IRQ 8"`
> >
> > However that doesn't work in ubuntu. The reason is that there seems to
> > be no process named "IRQ 8":
> >
> > atte@email-addr-hidden:~$ ps aux | grep -i IRQ
> > root 3 0.0 0.0 0 0 ? SN 13:43 0:00
> > [ksoftirqd/0]
> > atte 6274 0.0 0.0 2884 772 pts/0 R+ 13:51 0:00 grep -i
> > irq
>
> Hi,
>
> Your ubuntu kernel doesn't support this feature, to be sure try to look
> at /proc/config.gz
> zcat /proc/config.gz | grep PREEMPT
>
> You must have something like this :
> CONFIG_PREEMPT_HARDIRQS=y
>
> It appears that the default kernel used by Ubuntu studio
> (linux-image-lowlatency) is not patched against the Ingo's RT patch
> (required to do what you want)
> http://www.mail-archive.com/debian-multimedia@email-addr-hidden/msg01756.htm
>l The RT kernel package seems to be linux-image-2.6.21-1-multimedia-486
> <http://apt.64studio.com/64studio/testing/pool/main/l/linux-2.6/linux-image
>-2.6.21-1-multimedia-486_2.6.21-2_i386.deb>
>
> David C.
>
>
>
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it's probably, actually, because there's a dash in the proc name. IRQ-8,
etc...
james
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Received on Sat Jul 21 20:15:03 2007
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