Bug 80772

Summary:	Windows XP: PulseAudio consumes too much CPU when launched with high priority
Product:	PulseAudio	Reporter:	Michael DePaulo <mikedep333>
Component:	misc	Assignee:	pulseaudio-bugs
Status:	RESOLVED MOVED	QA Contact:	pulseaudio-bugs
Severity:	normal
Priority:	medium	CC:	lennart
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Windows (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	PulseAudio log while this bug is reproduced on XP SP3 32-bit

Description Michael DePaulo 2014-07-01 21:26:57 UTC

Created attachment 102099 [details]
PulseAudio log while this bug is reproduced on XP SP3 32-bit

As reported in the X2Go bugtracker (bug #526 by "Nable 80"):
http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=526

When I use sound forwarding and launch inside X2Go session some application
with sound support, pulseaudio.exe at client side starts consuming ~100% CPU.
By default, X2Go Client starts pulseaudio.exe with high priority (13).
When I set priority to "Above Normal (10)" PA's CPU load drops to 10-20%.
With "Normal (8)" it drops to almost 0%, although sound is still played stable,
without any additional delays.

I'm using WinXP SP3 (32-bit) on my laptop with single core CPU.
This issue seems to be "PulseAudio 5.0 && WinXP"-specific.

--------

As I mentioned in a follow-up, I was able to reproduce this issue on a VM. ("setup #2")  Therefore, I assume it affects all Windows XP machines. The VM was dual-core and only 1 CPU core was being maxed out by PulseAudio. 

I also assume it affects windows server 2003 and server 2003 R2 due to their similarity with Windows XP. Those 2 server OS's are supported by Microsoft through July 2015.

For now, we on the X2Go project plan to work around this bug by lowering the priority of PulseAudio, but only when we are running on Windows XP or server 2003 (R2). We ship & use PulseAudio 5.0 on Windows.

I ran into another bug ("setup #1") (I cloned it as bug #530), but I think that an OS misconfiguration that was at fault. So just ignore that in this bug report.

Comment 1 Raymond 2014-07-02 06:36:22 UTC

null)] pulsecore/protocol-native.c: Requesting rewind due to end of underrun.
D: [(null)] pulsecore/protocol-native.c: Requesting rewind due to end of underrun.
D: [(null)] pulsecore/protocol-native.c: Requesting rewind due to end of underrun.
D: [(null)] pulsecore/protocol-native.c: Requesting rewind due to end of underrun.
D: [(null)] pulsecore/protocol-native.c: Requesting rewind due to end of underrun.


do module-waveout support rewind ?

Comment 2 GitLab Migration User 2018-07-30 09:34:17 UTC

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

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