[pulseaudio-tickets] [Bug 81288] New: High cpu useage when running Skype

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81288

          Priority: medium
            Bug ID: 81288
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: High cpu useage when running Skype
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: linuxhippy at gmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: core
           Product: PulseAudio

Created attachment 102690
  --> https://bugs.freedesktop.org/attachment.cgi?id=102690&action=edit
sysprof screenshot of system-wide profile run

Running skype on my mother's old Pentium-4 based laptop, I noticed pulseaudio
consumes a fairly high share of CPU ressources.

As can be seen in the attached sysprof-screenshot, pulseaudio consumes almost
half the cycles skype does. However this was a video-call - so skype was not
only de- and encoding audio, but also video. Furthermore, pulseaudio consumed
almost 3 times the CPU cycles of Xorg required to push the video pixels to the
display.

System:
- Pentium 4, 2.6ghz
- Fedora 20 + latest updates
- pulseaudio-4.0-13.gitf81e3.fc20.i686

I've seen similar behaviour on my modern (sandy bridge core-i7) x86_64 laptop,
where pulseaudio consumes as much CPU cycles just playing sound as mplayer
needs to decode and display/output video and audio.

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