diagnostic tools to trace the reason xruns are happening?

bart deruyter bart.deruyter at gmail.com
Sun Jun 5 09:44:37 UTC 2011

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.

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

but thanks for the help of course.. step by step, we'll get there.. we just
have to.


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

> Is CPU frequency scaling set to 'performance'? If you start a GNOME
> session, I bet it will switch the governor to 'ondemand', if so, you
> only need to set CPU frequency scaling to 'performance'.
> Using a PREMPT kernel have proved a receipt for issues when doing audio
> work. You need a  kernel PREEMPT RT or kernel ex 2.6.39.
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