[PD] Pd-extended + Ubuntu Gutsy generic kernel versus rt kernel
columbiatwo at free.fr
Tue Dec 25 11:46:13 CET 2007
Interesting point here. Do you mean you edited the
/etc/security/limits.conf even when running the non rt kernel and that
it made things better than with the non-edited /etc/security/limits.conf ?
That's definitely one thing I must try then...
To get even more off-topic (even though I'm not really convenced it is)
I noticed as well that rt kernels are really aggressive. For instance
when I just play mp3s through jack with the hdsp driver it eats all
performance for the rest of desktop apps which then get really really
sluggish (on a PIV 3000MHz...).
Daniel Wilcox a écrit :
> To all those Pd Ubuntu-ers out there,
> I have been using the realtime (lowlatency) kernel for a while, back
> since Feisty, and compiled my own in Dapper.
> I have noticed that, at least with Gusty, the generic kernel works
> better then the rt kernel, giving me much *fewer*? xruns
> and artifacting with Pd ... while using the rt kernel, Pd seems to
> "sput" xruns while using Jack. It's important to note that I
> did enable the realtime privledges by writing to the security config as
> noted on the Ubuntu studio page:
> sudo su -c 'echo @audio - rtprio 99 >> /etc/security/limits.conf'
> sudo su -c 'echo @audio - memlock 250000 >> /etc/security/limits.conf'
> sudo su -c 'echo @audio - nice -10 >> /etc/security/limits.conf'
> Could it be that the preemption enabled in the rt kernel is a bit *too*
> aggressive? Realtime audio in PD with Jack seems to run much
> better with the generic kernel! Even at a 8ms latency ... in fact I'm
> testing the same on my slow performance computer (PIII 500MHz) with a
> fresh install of a Minimal command line Gutsy and it works *soooo* much
> better then the realtime kernel. (Plus suspend and
> hibernation work, while they don't using the realtime kernel.)
> Dan Wilcox
> www.robotcowboy.com <http://www.robotcowboy.com>
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