Dual processor problem with vncviewer on XP

[Richard Fox]

James,

I tried your suggestion to upgrade to the latest display driver. That did
not solve the problem.
I then tried removing the NVIDIA driver, and running the client using the
windows XP VGA driver.  The problem persisted.

--Richard--

-----Original Message-----
From: James Weatherall [mailto:james.weatherall "at" realvnc.com] 
Sent: Tuesday, August 14, 2007 6:55 AM
To: 'Richard Fox'; vnc-list "at" realvnc.com
Subject: RE: Dual processor problem with vncviewer on XP

Hi Richard,

It sounds like you have a problem with the display drivers on your system.
You might find that there's an upgrade from the manufacturer to fix problems
of this sort.

Regards,

Wez @ RealVNC Ltd


> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com
> [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Richard Fox
> Sent: 14 August 2007 00:06
> To: vnc-list "at" realvnc.com
> Subject: Dual processor problem with vncviewer on XP
> 
> I am looking for help on a problem with display freezes in vncviewer 
> running on a dual processor computer with Windows XP.
>  
> The primary symptom is that vncviewer running on a dual processor 
> client freezes its video after a few seconds or a few minutes. But, it 
> works fine when I change boot.ini to run only one processor.
>  
> Additional Symptoms:
>     The vnc link stays active, even though the viewer video is frozen.
>     The mouse on the client continues to control the cursor on the 
> server, even though the video on the client is frozen.
>     High data rate video, such as YouTube video, or rapid scrolling in 
> Excel, causes the freeze to occur sooner than when the screens are 
> fairly quiet.
>     The debug log at level 100 is "effectively identical" for a 
> successful 1 processor session, and for a frozen 2 processor session.
>     Assigning vncviewer process affinity to a single processor does 
> not fix the problem.
>     Assigning all process affinities except vncviewer to one 
> processor, and assigning vncviewer to the other processor does not fix 
> the problem.
>     Changing routers does not fix the problem.
>     Turning off all firewalls and all anti-virus programs does not fix 
> the problem.
>     The Java version of vncviewer also exhibits the freeze-up.
>     Reversing the roles of the client and the server does not freeze 
> up.
> Winvnc works fine on the dual processor machine, and vncviewer works 
> on the other (single processor) machine.
>     Connecting to the same server from a different client computer 
> that has a single processor does not freeze up. The problem appears to 
> be localized to the dual processor machine.
>  
> Client Configuration:
>     vncviewer personal edition P.4.2.3 
>     Windows XP Home with latest updates
>         Including Windows Patch KB896256 for AMD dual processors
>         Including AMD dual core processor patch 1.3.2.16
>         Including AMD dual core optimizer
>     AMD Athlon 64 X2 Dual Core Processor 4400+
>     3 Gigabytes of RAM
>     GeForce 6800 XT video card
>     1 gigabit port to Linksys router
>  
> Server Configuration:
>     winvnc4 4.1.2.0
>     Windows XP Home with latest updates
>     Dell Inspiron 8600 laptop
>     100 mbps port to the same Linksys router
>  
> Network configuration:
>     This is a local area network connected through a Linksys router. 
>     The 2 computers are in the same room.
>     I am controlling the server (a laptop) through the screen and 
> keyboard of the client (a desktop with a large screen and good 
> keyboard.)
>     The vnc logs report a 20,000 kbps connection    
>  
> Thanks
>  
> --Richard Fox--
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