[Bug 368121] Re: CPU usage spikes to 30% regularly during playback, no PulseAudio involved, just ALSA

[mathew]

Your behavior may be normal, drapsag, but there's no sample rate
conversion involved with my setup.

I ran oprofile to see what was chewing the CPU, and here are the top
entries from the log...

CPU: CPU with timer interrupt, speed 0 MHz (estimated)
Profiling through timer interrupt
samples  %        linenr info                 image name               app name                 symbol name
16416    68.4485  (no location information)   no-vmlinux               no-vmlinux               (no symbols)
6129     25.5556  (no location information)   libmad.so.0.2.1          libmad.so.0.2.1          (no symbols)
413       1.7221  pcm_dither.c:75             mpd                      mpd                      pcm_dither_24_to_16
367       1.5303  (no location information)   libc-2.9.so              libc-2.9.so              (no symbols)
94        0.3919  (no location information)   libglib-2.0.so.0.2000.1  libglib-2.0.so.0.2000.1  (no symbols)
89        0.3711  mp3_plugin.c:1061           mpd                      mpd                      mp3_decode
74        0.3086  (no location information)   libasound.so.2.0.0       libasound.so.2.0.0

So looks like it's either a kernel problem, or libmad. My sound card is
snd_via82xx.

(Not sure how Ubuntu has libmad 0.2.1, given that the current version on
the MAD web site is 0.15.1b.)

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CPU usage spikes to 30% regularly during playback, no PulseAudio involved, just ALSA
https://bugs.launchpad.net/bugs/368121
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