Re: [LAU] Testing JACK and PA latency

For comparison taking PA out of the graph: jack_iodelay (out) -> ecasound (in) -> ecasound (out) -> system (out) -> system (in) -> jack_iodelay (in) I see stable performance with the following result after a few seconds of "burn in". 218.905 frames 4.561 ms total roundtrip latency extra loopback latency: 26 frames use 13 for the backend arguments -I and -O ?? Inv However after switching to the browser and writing this email then switching back again I see the following data: 33114.906 frames 689.894 ms total roundtrip latency extra loopback latency: 32922 frames use 16461 for the backend arguments -I and -O ?? Switching back to the browser to write some more I see the a stable 4.561ms again and that has stayed stable after a couple of switches between browser/console. After more test the latency is definitely being affected by xorg and switching between apps but not every time. With only jack_iodelay running I see the cpu load hovering between 30 to 40%. With ecasound added to the graph I see cpu load hovering between 30 to 50%. Ecasound has not reported any underruns during this test. With PA included I had 32 underruns over night (approx 6 hours of running). The things I am now trying to rule out or trace: - Potential priority conflicts between jack and xorg (I'm running gnome3) - What causes erratic results with PA in the graph Suggestions welcome. -- Patrick Shirkey Boost Hardware Ltd