Re: Dmix using more CPU than plug:hw

[Takashi Iwai <tiwai@suse.de>]

At Wed, 11 May 2005 16:03:33 +0200,
Thierry Vignaud wrote:
> 
> Takashi Iwai <tiwai@suse.de> writes:
> 
> > > I'm playing around with Polypaudio (an EsoundD replacement) and
> > > find that it works really well when I connect it to the plug:hw
> > > and the CPU usage is as I would expect.
> > > 
> > > If on the other hand I connect Polypaudio to the plug:dmix1
> > > (defined as below) device it attempts to chew up 100% of CPU and
> > > then dies.
> > > 
> > > The ALSA version is whatever is in the 2.6.11 kernel. I have also
> > > seen this problem on two different systems (iBook/Tumbler and
> > > ia32/CMI8738) so its not hardware specific.
> > > 
> > > Does anyone have any ideas as to why a dmix device behaves so
> > > differently to plug:hw?
> > 
> > Does it still happen with 1.0.9rc3?
> 
> afaic artsd with alsa-lib-1.0.9rc3 eats quite lots cpu time. i've got
> similar reports from people that previously reported that artsd was
> using too much cpu time.

That's bad.  I hope it got fixed now.

Anyway, this high CPU usage is usually solved when you run without
rate conversion in alsa-lib.  Specify 48000Hz for artsd or polyaudio.


Takashi


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