Le 13/08/2012 19:40, Peter Meerwald a ?crit : > 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
