Comment 10 for bug 503174
Revision history for this message
| Alistair Buxton (a-j-buxton) wrote Re: PulseAudio ALSA plugin opens and closes the PulseAudio sink several times per second for no reason | #10 |
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1b1ed1a
(Get the code!)
It is extremely interesting that the buffer is so large on Lucid. When the buffer is 33791 and the playback is 44100 this causes nearly a second delay between audio being buffered and being played. With a 1048576 buffer that will be 23 seconds.
Also, while the underrunning may well be hardware dependent, PulseAudio closing and reopening the audio sink when a buffer underrun happens is not, and means that a program such as the example I posted can do a denial of service attack on Pulse just by intentionally underrunning the buffer repeatedly - which causes Pulse to eat 100% CPU opening and closing the sink.