[alsa-devel] Fast Track Ultra latency and new streaming logic.

Clemens Ladisch clemens at ladisch.de
Thu May 3 16:13:16 CEST 2012

Felix Homann wrote:
> I've even done some measurements using jack_iodelay. At 96 kHz I get a
> total round trip latency of 17.5 ms. According to the jack_iodelay
> manpage this corresponds (if I get it right) to an hardware
> input/output latency of the device of ~584 frames (6.1 ms).

USB playback also adds further latency by queueing the packets; the
number of packets can be seen under "URBs" in /proc/asound/card?/stream0.
(There are 1000/8000 packets per second at full/high speed.)


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