rt kernel

[Bernard Hurley]

Hi

On Wed, Apr 06, 2011 at 11:47:02AM +0200, Ralf Mardorf wrote:
> Hi all :)
> 
> 
> Note that today we should prefer the tickless timer. I'm enabling it on
> Maverick by my session start scripts:
> 
> lsmod | grep snd_hrtimer
>  case $? in
>     1)
> 	echo "Enabling HR TIMER for ALSA MIDI playback queue timer resolution
> 1000000000 Hz"
> 	sudo chgrp audio /dev/hpet
>         sudo chmod g+rw /dev/hpet
> 	sudo modprobe snd-hrtimer
> 	;;
>     *)
>         echo "HR TIMER for ALSA MIDI playback queue timer resolution
> 1000000000 Hz is enabled"
>         ;;
>  esac
> 
> The 1000 Hz timer still isn't obsolet, because HPET/HR timer sometimes
> does cause issues on some machines, resp. when running some apps, e.g.
> Rosegarden will freeze the computer, but e.g. Qtractor is working.
> Anyway, using the tickless timer when ever possible, will cause
> something that is nearer to 'hard real time'.
> HPET is enabled for Maverick's kernel 2.6.35-28-generic too.

Does this mean I can't use Rosegarden if I do this? Or is there some way of using both timers?

> 
> FWIW compiling 2.6.33.7.2-rt30 for Maverick is easy to do, I posted a
> scrip on that list.
> 

Thanks I'll have a look at this.

  /Bernard