A computer that is running an x86-based version of Windows Server 2008 or an x86-based version of Windows Vista may use fewer processors than expected if the number of cores on a socket is not a power of 2

Article translations Article translations
Article ID: 950182 - View products that this article applies to.
Expand all | Collapse all

On This Page

SYMPTOMS

Consider the following scenario:
  • You have a computer that uses a multicore processor. The number of the cores on a socket is not a power of 2. For example, the computer has a 6-core processor.
  • You install an x86-based version of Windows Server 2008 or an x86-based version of Windows Vista on the computer.
In this scenario, you experience the following problems:
  • When you check the number of processors in some user interfaces, such as in Task Manager, the number that is displayed is lower than the actual number.
  • Performance of the computer is lower than expected.
Notes
  • These problems are specific to Intel processors and do not affect AMD processors.
  • These problems occur only on an x86-based version of Windows Server 2008 and on an x86-based version of Windows Vista.

CAUSE

Windows Server 2008 and Windows Vista use fewer processors than are available because of an error in the operating system licensing.

RESOLUTION

Hotfix information

Windows Server 2008

A supported hotfix is 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 software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Prerequisites
No prerequisites.
Restart requirement
You have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other previously released hotfixes.
Registry information
To use this hotfix, you do not have to make any changes to the registry.
File information
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 item in Control Panel.
Windows Server 2008, x86-based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntkrnlpa.exe6.0.6001.221453,600,95228-Mar-200803:38Not Applicable
Ntoskrnl.exe6.0.6001.221453,548,72828-Mar-200803:38Not Applicable

Windows Vista

A supported hotfix is 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 software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Prerequisites
No prerequisites.
Restart requirement
You have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other previously released hotfixes.
Registry information
To use this hotfix, you do not have to make any changes to the registry.
File information
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 item in Control Panel.
Windows Vista, x86-based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntkrnlpa.exe6.0.6000.208023,505,72028-Mar-200803:22Not Applicable
Ntoskrnl.exe6.0.6000.208023,471,92828-Mar-200803:22Not Applicable

Windows Vista Service Pack 1, x86-based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntkrnlpa.exe6.0.6001.221453,600,95228-Mar-200803:38Not Applicable
Ntoskrnl.exe6.0.6001.221453,548,72828-Mar-200803:38Not Applicable

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" 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, about the performance or reliability of these products.

Properties

Article ID: 950182 - Last Review: October 8, 2011 - Revision: 2.0
APPLIES TO
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Home Premium
  • Windows Vista Ultimate
Keywords: 
kbhyperv kbautohotfix kbexpertiseadvanced kbfix kbqfe KB950182

Give Feedback

 

Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from smallbusiness.support.microsoft.com