excessive CPU use

[Ken Pratt]

Binary package hint: rhythmbox

When playing a song streamed by Firefly on a local server, Pulsaudio uses about 30% CPU and Rhythmbox uses about 30%. This CPU usage behaviour does not occur under the 8.10 version of Ubuntu. Additionally, if I play a stream from last.fm, Pulseaudio goes to almost 100% CPU and the audio is badly broken up.

I am reporting the Pulsaudio problem here as it may be the root cause.

If it is not already captured by apport:

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu jaunty (development branch)
Release: 9.04
Codename: jaunty
kpratt@balrog:~$

Linux balrog 2.6.28-8-generic #24-Ubuntu SMP Wed Feb 18 18:48:55 UTC 2009 i686 GNU/Linux

Installed on a Pentium D HP media Center PC m7160n with 4 Gig mem.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/rhythmbox
NonfreeKernelModules: nvidia
Package: rhythmbox 0.11.6svn20090209-0ubuntu1
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: rhythmbox
Uname: Linux 2.6.28-8-generic i686

[Ken Pratt (kenpratt)]

In my case, pulseaudio does not segfault. I'm not sure this is a duplicate of 330814. pulseaudio consumes too much CPU and playback is choppy. I've also noticed that playback from mythtv is choppy - both audio and video. Very reminiscent of IRQ conflicts leading to lost interrupts back in the old day of manual IRQ setting. It is as if a DMA buffer is not getting transferred.