X2Go Bug report logs - #530
Windows: PulseAudio severely slows down WinXP machines with

version graph

Package: x2goclient; Maintainer for x2goclient is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goclient is src:x2goclient.

Reported by: Nable 80 <nable.maininbox@googlemail.com>

Date: Sun, 29 Jun 2014 14:05:01 UTC

Severity: normal

Tags: build-win32

Found in version 4.0.2.0

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Report forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>:
Bug#526; Package x2goclient. (Sun, 29 Jun 2014 14:05:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Nable 80 <nable.maininbox@googlemail.com>:
New Bug report received and forwarded. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>. (Sun, 29 Jun 2014 14:05:01 GMT) Full text and rfc822 format available.

Message #5 received at submit@bugs.x2go.org (full text, mbox):

From: Nable 80 <nable.maininbox@googlemail.com>
To: submit@bugs.x2go.org
Subject: Included PulseAudio consumes too much CPU when launched with high priority
Date: Sun, 29 Jun 2014 18:04:42 +0400
Package: x2goclient
Version: 4.0.2.0

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.


Information forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>:
Bug#526; Package x2goclient. (Sun, 29 Jun 2014 15:05:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to Mike Gabriel <mike.gabriel@das-netzwerkteam.de>:
Extra info received and forwarded to list. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>. (Sun, 29 Jun 2014 15:05:03 GMT) Full text and rfc822 format available.

Message #10 received at 526@bugs.x2go.org (full text, mbox):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Nable 80 <nable.maininbox@googlemail.com>, 526@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#526: Included PulseAudio consumes too much CPU when launched with high priority
Date: Sun, 29 Jun 2014 15:03:17 +0000
[Message part 1 (text/plain, inline)]
Control: tag -1 build-win32

Hi Nable,

On  So 29 Jun 2014 16:04:42 CEST, Nable 80 wrote:

> Package: x2goclient
> Version: 4.0.2.0
>
> 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.

thanks for handing this one in.

Our PA expert will take a look at that (I hope!).

Mike
-- 

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fon: +49 (1520) 1976 148

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mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

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https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.xfb
[Message part 2 (application/pgp-signature, inline)]

Added tag(s) build-win32. Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 526-submit@bugs.x2go.org. (Sun, 29 Jun 2014 15:05:03 GMT) Full text and rfc822 format available.

Information forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>:
Bug#526; Package x2goclient. (Sun, 29 Jun 2014 15:50:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Nable 80 <nable.maininbox@googlemail.com>:
Extra info received and forwarded to list. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>. (Sun, 29 Jun 2014 15:50:02 GMT) Full text and rfc822 format available.

Message #17 received at 526@bugs.x2go.org (full text, mbox):

From: Nable 80 <nable.maininbox@googlemail.com>
To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Cc: 526@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#526: Included PulseAudio consumes too much CPU when launched with high priority
Date: Sun, 29 Jun 2014 19:47:44 +0400
[Message part 1 (text/plain, inline)]
Hi Mike!

> Our PA expert will take a look at that (I hope!).
I've attached possible workaround, although I'm not sure if it's acceptable.
[pa-disable-high-priority.diff (text/plain, attachment)]

Information forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>:
Bug#526; Package x2goclient. (Mon, 30 Jun 2014 14:15:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Michael DePaulo <mikedep333@gmail.com>:
Extra info received and forwarded to list. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>. (Mon, 30 Jun 2014 14:15:01 GMT) Full text and rfc822 format available.

Message #22 received at 526@bugs.x2go.org (full text, mbox):

From: Michael DePaulo <mikedep333@gmail.com>
To: Nable 80 <nable.maininbox@googlemail.com>, 526@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#526: Bug#526: Included PulseAudio consumes too much CPU when launched with high priority
Date: Mon, 30 Jun 2014 10:11:03 -0400
[Message part 1 (text/plain, inline)]
Hi Nable,

1. thank you for the patch. Command line testing shows that it does
lower the priority for PulseAudio 5.0 on Windows to "normal".
PulseAudio 1.1 ignores the argument and remains at "high" priority,
even though --help states that it recognizes the argument. 0.9.6
defaults to normal priority anyway. None of them refuse to start when
the argument is passed though.

2. I will incorporate your patch (it's only 1 line after all,) but
after talking with the PulseAudio developers, I will extend it so that
"normal" priority will only be set on Windows XP and Server 2003 /
Server 2003 R2. On Windows Vista / server 2008 and later, we will
continue to default to "high" priority.
(You are welcome to extend the patch to do this, or I will do extend
it later today or tomorrow.)

3. Right now I cannot test the patch with x2goclient because the
WIndows build VM has a networking problem. Mike#1 will fix that
problem sometime this week.

4. My testing reveals the following:
a. I am able to reproduce this bug. See setup #2 below.
b. I encountered a different bug with the virtual hardware (setup #1),
which is fixed by switching to a different sound driver (setup #2). I
will clone this bug report for my setup #1 bug.
c. This bug does not result in high CPU usage until audio is playing,
unlike my bug.
d. Manually  lowering the priority in task manager does appear to be a
valid workaround.

5. All my test details:

setup #1:
Note: default sound driver. I think I have a driverpacks.net driver
pack installed though, so it may not be the default driver for XP
without said driver pack.
Host & Hypervisor: Fedora 20 w/ KVM/virt-manager
VM accessed via: VirtViewer 0.6.0 64-bit for Windows w/ the SPICE protocol
Guest OS: Windows XP SP3 32-bit
vCPUs : 2 (host has 4 cores, core i5 750)
Sound setting in virt-manager: ac97
Sound adapter according to Windows: Intel(r) AC'97 Audio Controller -
SIgmaTel Codec
Driver Provider: SigmaTel
Driver Date: 12/20/2001
Driver Version: 5.10.0.7159

Results with: PulseaAudio 5.0, PulseAudio 1.1, and PulseAudio 0.9.6
launched from the command-line:
The combined CPU usage of pulseaudio.exe + "System" is very high, even
at normal priority, and the VM is extremely slow overall. This occurs
before any sound as playing. In other words, as the process is
started, the CPU usage immediately goes up and the VM immediately
becomes extremely slow. The combined CPU usage is always greater than
or equal to 1 CPU core.See #1 for notes on the behavior of the
priority. And yes, "System" CPU usage is normally 0% or just above 0%,
when pulseaudio.exe is not running.
The attached logs are from said results.

Results with x2goclient 4.0.2.0 (PulseAudio 5.0):
X2Go client GUI is extremely slow for same reason as on the
command-line. Cannot test any further.


setup #2
Note: same as before, except for a different sound driver:
Host & Hypervisor: Fedora 20 w/ KVM/virt-manager
VM accessed via: VirtViewer 0.6.0 64-bit for Windows w/ the SPICE protocol
Guest OS: Windows XP SP3 32-bit
vCPUs : 2 (host has 4 cores, core i5 750)
Sound setting in virt-manager: ac97
Sound adapter according to Windows: Intel(r) 82801AA AC'97 Audio Controller
Driver Provider: Microsoft
Driver Date: 7/1/2001
Driver Version: 5.1.2535.0

Results with: PulseaAudio 5.0, PulseAudio 1.1, and PulseAudio 0.9.6
launched from the command-line:
Whether I have normal priority or high priority, there is no high CPU
usage for either process, and no VM slowdown.

Results with x2goclient 4.0.2.0 (PulseAudio 5.0):
I reproduced this bug reported by Nable. I also observed that lowering
PulseAudio to normal fixes the problem. Only 1 vCPU was maxed out for
me (Nable had single core.) Also, unlike my problem with setup #1, the
VM is not extremely slow. Also, unlike my problem setup #1, CPU usage
is not high until audio is playing. Also, unlike my problem on
setup#1, "System's usage is 0% or a few % like normal.  There seems to
be a 1 second delay in audio, but that may be due to me accessing the
VM over Virt-Viewer. Also, the delay occurs at high priority.

-Mike#2

On Sun, Jun 29, 2014 at 11:47 AM, Nable 80
<nable.maininbox@googlemail.com> wrote:
> Hi Mike!
>
>> Our PA expert will take a look at that (I hope!).
> I've attached possible workaround, although I'm not sure if it's acceptable.
>
> _______________________________________________
> x2go-dev mailing list
> x2go-dev@lists.x2go.org
> http://lists.x2go.org/listinfo/x2go-dev
[pulse-0.9.6-on-xp-normal-priority-defaulted-log.txt (text/plain, attachment)]
[config.test.pa (application/octet-stream, attachment)]
[pulse-1.1-on-xp-normal-priority-ignored-log.txt (text/plain, attachment)]
[pulse-5.0-on-xp-normal-priority-log.txt (text/plain, attachment)]

Bug 526 cloned as bug 530 Request was from Michael DePaulo <mikedep333@gmail.com> to control@bugs.x2go.org. (Tue, 01 Jul 2014 20:55:01 GMT) Full text and rfc822 format available.

Changed Bug title to 'Windows: PulseAudio severely slows down WinXP machines with' from 'Included PulseAudio consumes too much CPU when launched with high priority' Request was from Michael DePaulo <mikedep333@gmail.com> to control@bugs.x2go.org. (Tue, 01 Jul 2014 20:55:01 GMT) Full text and rfc822 format available.

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