On Thu, 2012-04-26 at 12:39 -0700, Len Ovens wrote: > On Thu, April 26, 2012 12:19 pm, Ralf Mardorf wrote: > > >> * Pulse Audio <-> JACK bridging enabled by default [snip] > > > > ... Bridging? = No issues for 10 IOs? > > There are issues with bridging and they get worse as the latency goes > down. At -p 1024 there don't seem to be any problems. By -p 128 the bridge > uses the same cpu % that jack uses. (on my machine jack is 5% at idle, > with the PA-jack bridge 11%) By -p 32 the PA bridge uses double the cpu % > that jack does. (jack at about 12%, jack with bridge 30% +) > > Our next trick will be to enable switching it off and on. PA uses very > little cpu with bridging turned off. The main use (as I see) for PA-jack > bridging is for recording the output of apps that are PA only. For example > recording a phone interview on skype (I have heard a number of podcasts > done like that). Any other use is really not needed. If one is watching > youtube... they really don't need jack running at all. PA is just fine for > that. In some ways it would be nicer to have it off by default and only > turn it on when needed. > > My other comment is that the few times PA-jack is needed, it can probably > be run at a higher latency anyway.
Thank you Len, I didn't found information about the "algorithms [1]", sample accuracy, and jitter, I just found http://proaudio.tuxfamily.org/wiki/index.php?title=PulseAudio . [1] Resampling? So we don't hear what we produce? "app -> JACK (resample to 24/192) -> PulseAudio (resample to 16/44.1) -> ALSA sound driver -> audio device" - http://thewelltemperedcomputer.com/Linux/AudioArchitecture.htm Regards, Ralf -- Ubuntu-Studio-devel mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-devel
