Uros Bizjak wrote:
Could you put a printk() in snd_sb16_*_pointer() functions (sb16_main.c souce)? This printk() should print dma channel and value of ptr, so we can see when/if DMA channels gets stuck.
Done. The result put 2.6 megabytes into /var/log/messages. The head -10 and tail -50 of the relevant section is attached below; if anybody wants more detail the whole shebang is available at http://www.av8n.net/~jsd/alsa/messages.txt
BTW: It looks like another sb16 hardware bug to me. On module re-load, drivers reset sb16 chip, that is why module reload helps.
Plausible.... But note that the cs4239 module gets i/o errors when provoked by the same program, so there may be driver design weaknesses involved, too.
Perhaps you can derive a small test case from your application, which will help developers to stresstest soundcard and perhaps PCM layer?
My program is not super-small, but the relevant passages are simple and easy to find. You can help yourself at http://www.monmouth.com/~jsd/turbid/ Compile the thing and invoke it as ./turbid -F 440 or ./turbid -v -F 440 Note that just for you I added the --snooze <tt> option, which will cause it to generate an overrun every <tt> seconds (default .5) PROVIDED <tt> is not too small.
Dec 6 06:51:58 moat2 jsd: about to start .... Dec 6 06:52:03 moat2 turbid: PID file "/var/run/turbid.pid" already exists, not overwriting Dec 6 06:52:03 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 8 Dec 6 06:52:03 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 4110 Dec 6 06:52:03 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 4894 Dec 6 06:52:03 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 11 Dec 6 06:52:03 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 8206 Dec 6 06:52:03 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2055 Dec 6 06:52:03 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2239 Dec 6 06:52:03 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 12302 .... Dec 6 06:57:59 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 4129 Dec 6 06:57:59 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 6151 Dec 6 06:57:59 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 6176 Dec 6 06:57:59 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 6 Dec 6 06:57:59 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 33 Dec 6 06:57:59 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2053 Dec 6 06:57:59 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2081 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 4103 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 5861 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 6151 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 6317 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 7 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 34 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2055 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2081 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 4103 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 4129 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 6151 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 6177 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 7 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 242 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2055 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2083 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 4103 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 4129 Dec 6 06:58:00 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 6 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 6155 Dec 6 06:58:00 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 7893 Dec 6 06:58:00 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 4210 Dec 6 06:58:00 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 4386 Dec 6 06:58:10 moat2 turbid[4903]: Calout wrote 8820 got -5 Dec 6 06:58:10 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 8192 Dec 6 06:58:10 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 8192 Dec 6 06:58:10 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 0 Dec 6 06:58:10 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 0 Dec 6 06:58:20 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 8192 Dec 6 06:58:20 moat2 turbid[4903]: Calout wrote 8820 got -5 Dec 6 06:58:20 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 0 Dec 6 06:58:30 moat2 turbid[4902]: Read_stuff requested 2048 got -5: Input/output error Dec 6 06:58:30 moat2 turbid[4902]: turbid exiting, status 1 Dec 6 06:58:30 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 0 Dec 6 06:58:49 moat2 jsd: program has exited due to i/o error Dec 6 06:59:10 moat2 jsd: will restart it just for fun Dec 6 06:59:15 moat2 turbid: PID file "/var/run/turbid.pid" already exists, not overwriting Dec 6 06:59:15 moat2 kernel: snd_sb16_capture_pointer dma: 5 ptr: 8 Dec 6 06:59:15 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 11 Dec 6 06:59:25 moat2 turbid[4908]: Read_stuff requested 2048 got -5: Input/output error Dec 6 06:59:25 moat2 turbid[4908]: turbid exiting, status 1 Dec 6 06:59:25 moat2 kernel: snd_sb16_playback_pointer dma: 1 ptr: 2048 Dec 6 06:59:29 moat2 jsd: program has exited due to i/o error
