On 08/14/2012 10:16 AM, Goldy wrote:
Le 13/08/2012 19:40, Peter Meerwald a écrit :
Hello,
At this point, on system wide running, pulseaudio uses 34% cpu when it
idles, when music is played, it uses 42%. It's a lot on the 700 mhz
raspberry pi cpu, I'm pretty sure there is a way to decrease it, but
documentation don't talk about this point.
that sounds way too high...
unfortunately, the Broadcom CPU does not support ARM NEON
I found that the ARM assembler code does not improve performance on a
Cortex-A8, maybe it also helps to disable on the Raspberry?
I don't use the raspberry internal sound card, I plugged a little usb
Terratec aureon sound card, it works very well excepted the cpu usage...
would be interesting to find out where the CPU time is spent; in
PulseAudio or somethere in the USB stack...
do you have a chance to do some profiling? maybe you can get oprofile to
work?
regards, p.
Unfortunately, oprofile seems not to be working on raspberry... or I
didn't use it properly.
I followed the instructions here
http://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/Developer/OProfile
and I always get this :
% sudo opreport -l /usr/bin/pulseaudio
error: no sample files found: profile specification too strict ?
If you have any advice, it would be welcomed.
Thanks again
Christophe
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In profiling with oprofile on CuBox the code that is hogging cpu is the
Speex resampler.
I am currently trying to figure out how to get pulseaudio open without
triggering the resampler. There are about 3 tests in pulseaudio which
check for
the need to resample. If any of them evaluate as true, resampling kicks in.
To avoid resampling:
1. you can't use variable sample rate
2. the channel maps have to match
3. the sample rate has to match
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