[pulseaudio-tickets] [PulseAudio] #829: Default pulseaudio resampler (speex-float-3) sometimes too expensive?

[PulseAudio]

#829: Default pulseaudio resampler (speex-float-3) sometimes too expensive?
----------------------+-----------------------------------------------------
  Reporter:  sitsofe  |       Owner:  lennart
      Type:  defect   |      Status:  new    
 Milestone:           |   Component:  daemon 
Resolution:           |    Keywords:         
----------------------+-----------------------------------------------------

Comment(by sitsofe):

 {{{
 Perf output with pulseaudio (speex-float-3) performing the resampling on a
 2GHz
 laptop:

 # Samples: 31436365998
 #
 # Overhead          Command
 Shared Object
 # ........  ...............
 .....................................................
 #
     69.70%       pulseaudio  libspeexdsp.so.1.5.0
      8.88%       pulseaudio  [kernel]
      8.49%       pulseaudio  libpulsecore-0.9.21.so
      4.18%          swapper  [kernel]
      2.51%             init  [kernel]
      1.20%   wavparse0:sink  [kernel]
      0.68%       pulseaudio  libpulsecommon-0.9.21.so
      0.46%  perf.2.6.33.5-1  [kernel]
      0.36%       pulseaudio  libc-2.12.so
      0.29%   wavparse0:sink
 36f440b710


 Perf output with gstreamer performing the resampling on a 2GHz laptop:

 # Samples: 6170990658
 #
 # Overhead          Command
 Shared Object
 # ........  ...............
 .....................................................
 #
     31.41%  gst-launch-0.10  libgstaudioresample.so
     25.95%  gst-launch-0.10
 36fb854b55
      7.93%       pulseaudio  [kernel]
      7.91%  gst-launch-0.10  [kernel]
      5.55%          swapper  [kernel]
      3.54%             init  [kernel]
      2.09%  perf.2.6.33.5-1  [kernel]
      1.94%       pulseaudio  libpulsecore-0.9.21.so
      1.43%       pulseaudio  libpulsecommon-0.9.21.so
      1.13%  gst-launch-0.10  libpthread-2.12.so
      1.06%       pulseaudio
 ffffffffff60013b
      1.02%  gst-launch-0.10  libc-2.12.so
      0.74%  gst-launch-0.10  libglib-2.0.so.0.2400.1
      0.61%  perf.2.6.33.5-1  [btrfs]

 Perf output with ALSA performing the resampling on a 2GHz laptop (note
 ALSA doesn't seem to do the remapping pulseaudio does - you only hear
 front left and front right):

 # Samples: 1980908692
 #
 # Overhead          Command                                     Shared
 Object
 # ........  ...............
 ................................................
 #
     32.09%   wavparse0:sink  libgstaudioconvert.so
     11.12%          swapper  [kernel]
      8.47%   wavparse0:sink  libasound.so.2.0.0
      6.88%  perf.2.6.33.5-1  [kernel]
      6.50%   wavparse0:sink  [kernel]
      6.40%             init  [kernel]
      3.41%   wavparse0:sink  libgstreamer-0.10.so.0.25.0
      3.01%   wavparse0:sink  libc-2.12.so
      2.32%   wavparse0:sink  libglib-2.0.so.0.2400.1
      2.26%   wavparse0:sink  libpthread-2.12.so
      2.13%   wavparse0:sink  libgobject-2.0.so.0.2400.1
      1.95%             Xorg  [drm]
      1.86%  perf.2.6.33.5-1  [btrfs]
      1.79%             Xorg  [kernel]
      1.08%   wavparse0:sink  liboil-0.3.so.0.3.0
      0.92%   wavparse0:sink  libgstbase-0.10.so.0.25.0
      0.66%  perf.2.6.33.5-1  libc-2.12.so
      0.58%   wavparse0:sink  libgstaudio-0.10.so.0.20.0
      0.56%      kondemand/0  [kernel]
 }}}

 Perf output was collected for as long as gst-launch was running (it stops
 early when pulseaudio crashes).

-- 
Ticket URL: <http://pulseaudio.org/ticket/829#comment:3>
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