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

[Clemens Ladisch]

Felix Homann wrote:
> 2012/5/3 Clemens Ladisch <clemens at ladisch.de>:
>> 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.)
>
> I'm getting "URBs = 2 [ 5 6 ]"  for playback and  "URBs = 8 [ 8 8 8 8
> 8 8 8 8 ]" for capture with the "old" streaming logic. What does it
> mean?

The queue length is 5+6 = 11 packets; at high speed, that's
11 / 8 kHz = 1.4 ms.


Regards,
Clemens