An update that selectively disables the Core Parking feature in Windows 7 or in Windows Server 2008 R2 is available

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Article ID: 2646060 - View products that this article applies to.
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Introduction

This article introduces an update that enables the hotfix installer to selectively disable the Core Parking feature in Windows 7 or in Windows Server 2008 R2 if an AMD FX, AMD Opteron 4200 Series, or AMD Opteron 6200 Series processor is installed.

Currently, the CPU Power Policies that are used by Windows 7 and Windows Server 2008 R2 are not optimized for the dual core AMD Bulldozer module architecture. This architecture is found on AMD FX series, AMD Opteron 4200 Series, and AMD Opteron 6200 Series processors. This can result in decreased system performance with multithreaded workloads in lightly-threaded environments.

When this update is installed, Bulldozer modules will be less likely to achieve the C6 power state. This potentially results in increased power consumption in more lightly-threaded environments.

Important If you apply this update, you cannot revert the settings by uninstalling this update. This update should only be installed on computers that have KB2645594 installed.

RESOLUTION

Hotfix information

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 the problem described in this article. 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 website:
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

To apply this hotfix, you must be running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 Service Pack 1 (SP1).

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 1.21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
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File nameFile versionFile sizeDateTime
Disablecp.exe6.1.7601.2187014,24005-Dec-201121:31
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Disablecp.exe6.1.7601.2187015,26405-Dec-201121:05

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 about software update terminology, 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.

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameX86_42c42e5ae339e09319fd2ffec37b47a6_31bf3856ad364e35_6.1.7601.17735_none_cf273328a1404d78.manifest
File versionNot Applicable
File size719
Date (UTC)06-Dec-2011
Time (UTC)07:40
File nameX86_9eeb4f9fef67cb30acfb7c030e7242e2_31bf3856ad364e35_6.1.7601.21872_none_73e044e9f4a62762.manifest
File versionNot Applicable
File size719
Date (UTC)06-Dec-2011
Time (UTC)07:40
File nameX86_microsoft-windows-p..ecoreparking-oneoff_31bf3856ad364e35_6.1.7601.17735_none_6b5f3761a702ea53.manifest
File versionNot Applicable
File size975
Date (UTC)03-Dec-2011
Time (UTC)06:38
File nameX86_microsoft-windows-p..ecoreparking-oneoff_31bf3856ad364e35_6.1.7601.21872_none_6bba939ec043addc.manifest
File versionNot Applicable
File size975
Date (UTC)03-Dec-2011
Time (UTC)06:26
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_c41a4873cc2fb872fef1d7b682e73604_31bf3856ad364e35_6.1.7601.21872_none_99d361aab79e3208.manifest
File versionNot Applicable
File size723
Date (UTC)06-Dec-2011
Time (UTC)07:40
File nameAmd64_d683960f2fa5f94b586d710c7f24ab5b_31bf3856ad364e35_6.1.7601.17735_none_41f11363269ff9a3.manifest
File versionNot Applicable
File size723
Date (UTC)06-Dec-2011
Time (UTC)07:40
File nameAmd64_microsoft-windows-p..ecoreparking-oneoff_31bf3856ad364e35_6.1.7601.17735_none_c77dd2e55f605b89.manifest
File versionNot Applicable
File size983
Date (UTC)03-Dec-2011
Time (UTC)07:39
File nameAmd64_microsoft-windows-p..ecoreparking-oneoff_31bf3856ad364e35_6.1.7601.21872_none_c7d92f2278a11f12.manifest
File versionNot Applicable
File size983
Date (UTC)03-Dec-2011
Time (UTC)07:27

Properties

Article ID: 2646060 - Last Review: January 11, 2012 - Revision: 1.0
APPLIES TO
  • Windows 7 Service Pack 1, when used with:
    • Windows 7 Enterprise
    • Windows 7 Home Basic
    • Windows 7 Home Premium
    • Windows 7 Professional
    • Windows 7 Starter
    • Windows 7 Ultimate
  • Windows Server 2008 R2 Service Pack 1, when used with:
    • Windows Server 2008 R2 Datacenter
    • Windows Server 2008 R2 Enterprise
    • Windows Server 2008 R2 Foundation
    • Windows Server 2008 R2 Standard
    • Windows Web Server 2008 R2
Keywords: 
kbfix kbsurveynew kbexpertiseinter kbautohotfix kbhotfixserver kbqfe KB2646060

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