diagnostic tools to trace the reason xruns are happening?

[bart deruyter]

Ralf,

thanks for the explanation. It does work better with the performance
setting. I do still get xruns when using midi though. Using sooperlooper, I
trigger recording with the pedal of my keyboard, through an usb2midi
misport2x2.

I guess the search for the PREEMPT_RT kernel is in place.. is there a PPA I
could use, or do I have to build it myself? Or is it the
linux-headers-2.6.31-12-realtime? I have it listed in the falk-tx ppa.

grtz,
Bart
http://www.bartart3d.be/


2011/6/5 Ralf Mardorf <ralf.mardorf at alice-dsl.net>

> On Sun, 2011-06-05 at 11:44 +0200, bart deruyter wrote:
> > Ok, I did some tests, xruns keep happening on 512 Frames/Period and
> > 1024 Frames/Period at 48000, setting Periods/Buffer at 2. At 3
> > Periods/Buffer there is too much latency in my opinion.
> >
> > Next step, how do I change the governer from 'ondemand' to
> > 'performance'? I've never done that before, didn't even need to do
> > that in the previous ubuntustudio versions.
>
> You can run
>
> sudo -i
> cpufreq-selector -g performance
>
> The better choice is to
>
> right click to the GNOME panel > Add to panel... > CPU frequency scaling
> monitor
>
> Once it is in the panel, left click to the scaling monitor icon and
> chose 'performance'.
>
>
> >
> > About the kernel :
> > Weird, I keep reading from ubuntustudio that the generic kernel in
> > Ubuntustuido 11.04 should be good enough, on the wiki with the
> > comparing table I read better results from the lowlatency kernel.. and
> > now there is the need for the preempt rt.... It is getting very, very,
> > very confusing for me.
> >
> > but thanks for the help of course.. step by step, we'll get there.. we
> > just have to.
>
> For kernels before version 2.6.39 and this version isn't supported by
> any repository jet, real-time optimisation only is done with kernel-rt.
> A kernel without RT can work too, but when you get issues, then use a
> kernel-rt.
>
> Hth,
>
> Ralf
>
>
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