[alsa-devel] Missing exactly 3 of 8 audio packets?

Clemens Ladisch clemens at ladisch.de
Sun Nov 25 17:39:02 CET 2012

Daniel Mack wrote:
>> On 21.11.2012 21:13, Daniel Griscom wrote:
>>> 1) Once in a while (every few seconds or minutes) a single
>>> packet will be missed
>>> 2) Once in a longer while (every few minutes or hours), the
>>> system will go into a continuing error condition where three of
>>> every eight packets are missed.
> [...]
> This test will tell us whether data is in fact lost before it hits the
> usb audio driver, or if it's dropped by the USB HCD.

These look like hardware errors.  You might want to try to check the
frames' status in retire_playback_urb(), but this will show only DMA/
FIFO problems on the host; the HC will not be able to detect whether the
receiving device has handled the packet.


More information about the Alsa-devel mailing list