[linux-audio-dev] mux concept paper
S.W.Harris at ecs.soton.ac.uk
Thu Feb 17 16:33:30 UTC 2005
On Thu, Feb 17, 2005 at 11:20:06 -0500, Lee Revell wrote:
> > this has nothing to do with your noise. JACK uses CPU Hz to provide a
> > UST value. i am puzzled by the fact you are the 2nd person to think
> > that JACK's timing is somehow based on system timers and so
> > forth. JACK (in regular mode, using one of the normal backends) is
> > driven 100% by the interrupt from your audio interface. whether or not
> > the CPU Hz value is correct has (effectively) zero impact on audio
> > generation and timing.
> Besides, I wrote a patch to eliminate the /proc/cpuinfo hack, it's low
> prio but should be in JACK eventually. But like Paul says this has
> absolutely nothing to do with the sound.
Actually it can be on laptops with CPU scaling. JACK gets sufficiently
confused on mine that it tells ALSA to restart the card constantly,
causing all kinds of noise.
I have to lock the CPU to the maximum frequency to stop it happening.
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