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On Sun, Dec 30, 2012 at 9:46 AM, Fons Adriaensen wrote:
> On Sun, Dec 30, 2012 at 02:22:51PM +0000, Ben Bell wrote:

quoted text
>

> > Running with a more modest session hovering at 30% normally, pulling the

> > alsa_in channels (just into jack -- no connections) raises the CPU to

> ~55%

> > but there are no xruns.

> >

> > So it seems that the problem is most likely in the alsa multi plugin. As

> an

> > aside I'm surprised at the extent of resource usage caused by simply

> having

> > alsa_in running. Normal, or suspicious? jack_netsource doesn't cause this

> > sort of load, and tweaking sample rate and the like doesn't seem to

> affect

> > things. A side-effect of it expecting to need to resample everything?

>

> You could try zita-a2j instead of alsa-in. On my old 2G P4 machine

> adding 8 channels that way takes 10% CPU. Sound quality is vastly

> better than alsa-in.

>

it seems as if it may be wise to "replace" alsa_(in|out) with zita-a2j.

what do you think?
--f46d040168ddc1579404d213e08f

Content-Type: text/html; charset=ISO-8859-1
On Sun, Dec 30, 2012 at 9:46 AM, Fons Adriaensen <fons@linuxaudio.org> wrote:

On Sun, Dec 30, 2012 at 02:22:51PM +0000, Ben Bell wrote:
> Running with a more modest session hovering at 30% normally, pulling the

quoted text
> alsa_in channels (just into jack -- no connections) raises the CPU to ~55%

> but there are no xruns.

>

> So it seems that the problem is most likely in the alsa multi plugin. As an

> aside I'm surprised at the extent of resource usage caused by simply having

> alsa_in running. Normal, or suspicious? jack_netsource doesn't cause this

> sort of load, and tweaking sample rate and the like doesn't seem to affect

> things. A side-effect of it expecting to need to resample everything?

You could try zita-a2j instead of alsa-in. On my old 2G P4 machine

adding 8 channels that way takes 10% CPU. Sound quality is vastly

better than alsa-in.it seems as if it may be wise to "replace" alsa_(in|out) with zita-a2j. what do you think? 
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