Kernel-lowlatency vs kernel-rt

ttoine ttoine at ttoine.net
Sat Nov 3 00:19:53 UTC 2012


Ralf,

If you don't need restricted drivers, -rt kernel is better than the
-lowlatency. For audio, and for midi. If you need the restricted driver of,
for example, nvidia or amd/ati graphic cards, -rt may not work. That's why
there is the -lowlatency kernel.

Toine


2012/11/3 Ralf Mardorf <ralf.mardorf at alice-dsl.net>

> On Fri, 2 Nov 2012 23:58:39 +0100
> Ralf Mardorf <ralf.mardorf at alice-dsl.net> wrote:
>
> > Hi :)
> >
> > on Ubuntu Studio Quantal I switched to
> > $ uname -a
> > Linux qrc 3.6.5-rt14 #1 SMP PREEMPT RT Fri Nov 2 21:36:37 CET 2012
> > x86_64 x86_64 x86_64 GNU/Linux
> >
> > A kernel-rt seems to be much better on my machine.
> >
> > With the kernel-lowlatency for a very small audio session,
>
> Resp. a MIDI session using virtual synth.
>
> > CPU usage "< 10%", I get xruns with
> >
> > sample_rate=48000
> > frames_period=512
> >
> > Now, with the kernel-rt everything seems to be [Ok] with
> >
> > frames_period=256
> >
> > but with frames_period=128 I get xruns again.
> >
> > Regards,
> > Ralf
>
>
>
> Regards,
> Ralf
>
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