[pulseaudio-discuss] Pulse Audio System Overhead

Pierre Ossman ossman at cendio.se
Thu Feb 15 23:32:10 PST 2007

keith preston wrote:
> I am playing a MP3 through gstreamer(mad) to a pulseaudio sink (s16le
> 44100) to pulseaudio through the native protocol.
> In this configuration pulse audio was set up with an alsa output source
> (s16le 44100).  This is a direct alsa hookup (no dmix)

You completely sure you have the same in and out formats/rate? I'd
suggest feeding it with something that you know uses a different
format/rate and see how much CPU that eats.

> To me this seems like I am doing something wrong, that is quite a bit of
> overheard for essentially what should be transferring and buffering at a
> sound server.  I double and triple checked most of my setting.   Are there
> any performance detractors that I could be missing?   I started to
> investigate volume and noticed that changing the(pulse)  volume didn't
> affect CPU utilization.   Is the volume filter always on?   Even in the
> case
> where it should be an identity (100% volume).?  I definitely want to
> improve
> this, I just need a little guidance on where to look.

Volume is only done in software if that hardware is insufficent (no hw
support at all or not able to scale per channel).

Pierre Ossman            OpenSource-based Thin Client Technology
System Developer         Telephone: +46-13-21 46 00
Cendio AB                Web: http://www.cendio.com

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