Hello, i would like to ask you for experience with USB audio interfaces and BBB. I'm having trouble with BBB (rev. A6A) and audio playback with snd-usb-audio under higher interrupt loads. If i play audio through USB interface and for instance simultaneously transferring data from network mount, i will get audio dropouts. At first it is occasional thing and sounds like few milliseconds pops, but after while it happens more often and leading to serious stops at playback. It is not completely possible to avoid this situation in desired usage (MPD based network audio player) as this happens for instance during library update, when MPD is rereading tags from all songs.
- it occurs more often during streaming of high bitrate audio (eg. uncompressed stereo 176.4kHz) - ALSA driver access optimization doesn't help - memory mapped, different buffer and period lengths. - forcing PIO mode with CONFIG_MUSB_PIO_ONLY doesn't help - just for test i also tried network access through second USB port (virtual USB eth. interface) to exclude TI ethernet driver, but it is same. - it doesn't seems to be userspace CPU usage issue (tried to generate CPU load with fio and it didn't produce dropouts) - system doesn't print any other warnings or errors except of Xruns from ALSA layer. - I've tried several distributions with kernels 3.8.13 (Angstrom, Volumio), 3.12.9 (Voyage), 3.13 (development version of Debian Jessie from RobertCNelson image). - just for completeness, it is not issue of my USB interfaces (works great with other Linux systems and some are not bus powered to exclude possible issues with insufficient power from BBB USB port) My quick steps to reproduce.. initiate playback of hi-res audio wav from mmc with aplay and simultaneously open several parallel network TCP connections with iperf. Can anybody confirm me this issue with BBB? Do you have some tips, what to try next? Kind regards, Michal -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
