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

[mathew]

** Description changed:

  Binary package hint: mpd
  
  Opening another bug report for this, because none of the stuff in
  #221951 applies.
  
  I've got Ubuntu running headless on a 1GHz M10000. It was fine with 8.04
  and 8.10, but since upgrading to 9.04 MPD is chewing CPU. Every few
  seconds it spikes to 30% CPU usage.
  
  I'm not running PulseAudio, so it's not that. (I have libpulse0
  installed because MPD demands it, but no other packages matching
  *pulse*.)
  
  I've tried explicitly stating that I want ALSA output in /etc/mpd.conf, and that doesn't help. Right now it's:
  audio_output {
    type "alsa"
    format 44100:16:2
    name "audio out"
  }
  
  The MP3 files are sourced from 44.1kHz 16 bit rips of CDs, so it's not a
  sample rate issue.
  
  /var/log/mpd/errors.log says
  Apr 27 13:17 : problems opening audio device while playing "meta/Orchestral_Manoeuvres_in_the_Da/Organisation_Remastered/08-Promise.mp3"
  Apr 27 13:17 : problems opening audio device while playing "meta/Orchestral_Manoeuvres_in_the_Da/Organisation_Remastered/08-Promise.mp3"
  Apr 27 13:17 : problems opening audio device while playing "meta/Orchestral_Manoeuvres_in_the_Da/Organisation_Remastered/09-Stanlow.mp3"
  etc.
  
  The CPU usage peaks so badly that the audio is glitching. I upped the
  audio_buffer_size to 16384 to get something listenable. Suggestions?
+ 
+ [Update]
+ Also:
+ 
+ # cat pcm0p/sub0/hw_params
+ access: RW_INTERLEAVED
+ format: S16_LE
+ subformat: STD
+ channels: 2
+ rate: 44100 (44100/1)
+ period_size: 2048
+ buffer_size: 16384
+ 
+ while playing, so it's not a 44.1->48kHz conversion problem.

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