On Wed, Jan 30, 2013 at 07:14:11PM +0100, Robin Gareus wrote: > This works reliably; no x-runs: > jackd -d alsa -d hw:2 -r 48000 -p 64 -n 3 > jack-delay measures: 403.949 frames 8.416 ms > > > Occasional rare x-runs with > jackd --sync -d alsa -d hw:2 -r 48000 -p 64 -n 2 > roundtrip latency: 274.945 frames 5.728 ms That's odd. The difference should be one period, 64 frames. But it is 129 frames. > > Now we're closing in... > jackd --sync -d alsa -d hw:2 -r 48000 -p 32 -n 2 > roundtrip latency: 175.953 frames 3.666 ms > x-runs depend on system load. jack_capture still runs x-runs free for > > 1 hour. Idle DSP load is only 5.6% with the CPU in low-power (1GHz). Yet > jack_delay alone bumps DSP load up to 20%. The % load for jack_delay shouldn't depend much on the period size, it just processes period_size frames each time. If it does there could be significant wakeup jitter - jack measures the worst case load IIRC. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
