[LAU] xrun problems. (Was Re: Introduction to Ardour 3.0 MIDI)

[Robin Gareus]

On 04/03/2011 12:52 AM, Bernardo Barros wrote:
> I would be very embarrassed if I'm fooling myself, but from what I
> read the information provided by qjackctl, is this really the latency
> of the audio system as low as 0.08ms with frames/period of 2! :S

must be a typo:  2*16/ 44100Hz = 0.725ms = ~0.8ms

Measure it with 'jack_delay' [1]. The number given in qjackctl's setup
dialog is the nominal latency; and the time between two jack cycles.

Usually there's additional latency due to [PCI|USB] bus overhead,
sound-card & ALSA buffering, DAC/ADCs, etc. - around 1 ms round-trip for
PCI devices.
http://wiki.linuxaudio.org/wiki/jack_latency_tests

have fun,
robin


[1] http://kokkinizita.linuxaudio.org/linuxaudio/index.html