Public bug reported:

Binary package hint: pulseaudio

Pulseaudio has irregularly a high cpu usage on older thin clients used as LTSP 
clients which causes interruptions of sound (approx 2 sec or more).
LTSP connects pa to localhost and uses an ssh socket for connection to the 
server. With 0.9.14 I experienced similar problems like 
https://bugs.launchpad.net/ubuntu/+source/ltsp/+bug/236936.

Thus I installed:

r...@s400-13:/# dpkg -l | grep pulse
ii  gstreamer0.10-pulseaudio             0.10.14-1                       
GStreamer plugin for PulseAudio
ii  libpulse-browse0                     1:0.9.15-4ubuntu1               
PulseAudio client libraries (zeroconf suppor
ii  libpulse0                            1:0.9.15-4ubuntu1               
PulseAudio client libraries
ii  pulseaudio                           1:0.9.15-4ubuntu1               
PulseAudio sound server
ii  pulseaudio-esound-compat             1:0.9.15-4ubuntu1               
PulseAudio ESD compatibility layer
ii  pulseaudio-module-hal                1:0.9.15-4ubuntu1               HAL 
device detection module for PulseAudio s
ii  pulseaudio-module-x11                1:0.9.15-4ubuntu1               X11 
module for PulseAudio sound server
ii  pulseaudio-utils                     1:0.9.15-4ubuntu1               
Command line tools for the PulseAudio sound 

Please also see the syslog file attached. You can see all the options PA
is started with here:

pulse     3118  4.9  1.2  95660  5872 ?        S<l  20:32   1:27
/usr/bin/pulseaudio --system -vvvv --exit-idle-time=-1 --disable-shm
--no-cpu-limit --resample-method=trivial --high-priority --log-
target=syslog -L module-detect -L module-esound-protocol-tcp auth-
anonymous=1 -L module-native-protocol-tcp auth-anonymous=1 -L module-
volume-restore -L module-rescue-streams -L module-native-protocol-unix
auth-anonymous=1 -n

This only happens on older clients, new clients work smooth.I also tried
the hint to comment out "tsched=0" seen
here:https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/330006.
No result.

--------

Hardware + OS:
r...@s400-13:~# lspci    #thin client excerpt
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 741/741GX/M741 Host (rev 
03)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SG86C202
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS963 [MuTIOL Media IO] 
(rev 25)
00:02.1 SMBus: Silicon Integrated Systems [SiS] SiS961/2 SMBus Controller
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 
Sound Controller (rev a0)

r...@fai2:~# chroot /export/ltsp/i386/
r...@fai2:/# lsb_release -rd
Description:    Ubuntu 9.04
Release:        9.04

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: cpu excessive high pulseaudio underrun usage

-- 
0.9.15: irregular excessive cpu usage
https://bugs.launchpad.net/bugs/396709
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