Clemens:
Are you the right person to ask about snd-usb-audio? There's a bug report
against UHCI involving the sound driver:
http://bugzilla.kernel.org/show_bug.cgi?id=6994
According to the logs, the USB controller is getting bogged down. My
guess is there's a hardware bug in the controller.
However, the logs also showed that snd-usb-audio submits one iso URB,
containing only one packet, per ms. That creates a lot of interrupts; one
every millisecond. The computations in the driver are too complicated for
me to figure out quickly. However I don't see any reason why the driver
shouldn't put, say, 20 packets in each URB and then submit URBs every 20
ms.
This probably wouldn't solve the problem in the bug report.
Nevertheless, it would be better to reduce the frequency of interrupts by
submitting URBs that last for more than 1 ms. Can this easily be
accomplished?
Alan Stern
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