Microsoft KB Archive/899525

= When you run Virtual PC 2004 on a portable computer that uses the Intel Centrino 915 chipset, Virtual PC performance is reduced =

Article ID: 899525

Article Last Modified on 11/15/2007

-

APPLIES TO


 * Microsoft Virtual PC 2004

-





SYMPTOMS
When you run Microsoft Virtual PC 2004 on a portable computer that uses the Intel Centrino 915 chipset, Virtual PC performance is reduced when compared to its performance on portable computers that use older Centrino chipsets.



CAUSE
The Centrino 915 chipset has a new power saving architecture that disables the Time Stamp Counter (TSC) when the chipset uses the Intel SpeedStep technology. This behavior causes Virtual PC 2004 to make incorrect calculations.



RESOLUTION
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time        Size      File name --  19-Jun-2005  23:26     2,195,968   Vpc2004qfe899525_msdn.msp 19-Jun-2005 23:26     3,460,608   Vpc2004qfe899525_update.msp

Hotfix installation instructions
Select a hotfix file based on the following rules:
 * If you have installed Virtual PC 2004 and then upgraded the installation to Virtual PC 2004 Service Pack 1 (SP1), use the Vpc2004qfe899525_update.msp file to install this hotfix.
 * If you have installed Virtual PC 2004 with SP1, use the Vpc2004qfe899525_msdn.msp file to install this hotfix.

To apply this hotfix, follow these steps:  Run the appropriate .msp file for the Virtual PC 2004 installation type. Move to the %root%\Documents and Settings\%username%\Application Data\Microsoft\Virtual PC folder. Right-click the Options.xml file, and then click Edit.  Add the following code to the file.  true </virtual_machines>

Note The <virtual_machines> tags should be at the same level in the code as the <virtual_network> and <virtual_gateway> tags. </li></ol>

<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

<div class="moreinformation_section">

MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kbqfe kbhotfixserver kbfix kbpubtypekc KB899525

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.