An update is available for computers that have an AMD FX, AMD Opteron 4200, AMD Opteron 6200, or AMD Bulldozer series processor installed and that are running Windows 7 or Windows Server 2008 R2

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Article ID: 2645594 - View products that this article applies to.
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INTRODUCTION

This article introduces an update for computers that are running Windows 7 or Windows Server 2008 R2 and that have a processor from one of the following series installed:
  • AMD FX
  • AMD Opteron 4200/4300
  • AMD Opteron 6200/6300
  • AMD Opteron Bulldozer
Currently, the CPU scheduling techniques that are used by Windows 7 and Windows Server 2008 R2 are not optimized for the AMD Bulldozer module architecture. This architecture is found on AMD FX series, AMD Opteron 4200/4300 Series, and AMD Opteron 6200/6300 Series processors. Therefore, multithreaded workloads may not be optimally distributed on computers that have one of these processors installed in a lightly-threaded environment. This may result in decreased system performance for some applications.

Important The power management policy for processor core parking on your computer may prevent this update from producing the desired performance increase. To disable core parking, install the hotfix that is described in Microsoft Knowledge Base (KB) article 2646060.

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 update, you must be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
For more information about how to obtain a Windows 7 or a 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 use the update in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

File information

The English (United States) version of this update 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, SR_Level (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
    VersionProductSR_LevelService branch
    6.1.760 0 . 16xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 0 . 20xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1 . 17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1 . 21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, extremely important issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • 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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Ntkrnlpa.exe6.1.7601.177303,968,36824-Nov-201106:36Not applicable
Ntoskrnl.exe6.1.7601.177303,913,58424-Nov-201106:36Not applicable
Ntkrnlpa.exe6.1.7601.218663,971,44024-Nov-201106:33Not applicable
Ntoskrnl.exe6.1.7601.218663,916,65624-Nov-201106:33Not applicable
Powrprof.dll6.1.7601.17730145,92024-Nov-201106:22
Powrprof.dll6.1.7601.21866145,92024-Nov-201106:19
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Ntoskrnl.exe6.1.7601.177305,559,15224-Nov-201107:30
Ntoskrnl.exe6.1.7601.218665,560,68824-Nov-201107:22
Powrprof.dll6.1.7601.17730166,91224-Nov-201107:17
Powrprof.dll6.1.7601.21866166,91224-Nov-201107:11
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_2dc11e5b8725bc103ad85d9014a63c9c_31bf3856ad364e35_6.1.7601.21866_none_16cb00e87fc3192e.manifest
File versionNot applicable
File size697
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameX86_88c5023df903516a0c10fc42bbe18a1b_31bf3856ad364e35_6.1.7601.21866_none_54b4d01bb92b5a0a.manifest
File versionNot applicable
File size707
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameX86_b7824833a4340cc0bc3d0b7c7f471380_31bf3856ad364e35_6.1.7601.17730_none_71048f0353670f5f.manifest
File versionNot applicable
File size697
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameX86_db44d21e36e57293a4d87460fa4e0bf2_31bf3856ad364e35_6.1.7601.17730_none_281a4137bd4f8c6a.manifest
File versionNot applicable
File size707
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17730_none_6e1e2e581278f847.manifest
File versionNot applicable
File size16,151
Date (UTC)24-Nov-2011
Time (UTC)07:22
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21866_none_6e8d5d1b2ba983ee.manifest
File versionNot applicable
File size16,151
Date (UTC)24-Nov-2011
Time (UTC)07:23
File nameX86_microsoft-windows-userpowermanagement_31bf3856ad364e35_6.1.7601.17730_none_a5076b185b2e4550.manifest
File versionNot applicable
File size3,069
Date (UTC)24-Nov-2011
Time (UTC)07:16
File nameX86_microsoft-windows-userpowermanagement_31bf3856ad364e35_6.1.7601.21866_none_a57699db745ed0f7.manifest
File versionNot applicable
File size3,069
Date (UTC)24-Nov-2011
Time (UTC)07:16
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_2dc11e5b8725bc103ad85d9014a63c9c_31bf3856ad364e35_6.1.7601.21866_none_72e99c6c38208a64.manifest
File versionNot applicable
File size699
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_353308bd502801e6ce3b49f8762609e0_31bf3856ad364e35_6.1.7601.21866_none_2754f68f22bf6a87.manifest
File versionNot applicable
File size1,062
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_42c06791739a8341118fac980226ef13_31bf3856ad364e35_6.1.7601.21866_none_ffc2ef450274e471.manifest
File versionNot applicable
File size1,042
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_4a242f7b540bb3910de63c70553c18d5_31bf3856ad364e35_6.1.7601.17730_none_4edc930bd9612f8c.manifest
File versionNot applicable
File size701
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_776535ea1ac84184aea982d3fe99e184_31bf3856ad364e35_6.1.7601.17730_none_d10c726eaf1775a1.manifest
File versionNot applicable
File size711
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_7f218ae293910621bf56988e85af7091_31bf3856ad364e35_6.1.7601.21866_none_f94b4afde062b430.manifest
File versionNot applicable
File size701
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_88c5023df903516a0c10fc42bbe18a1b_31bf3856ad364e35_6.1.7601.21866_none_b0d36b9f7188cb40.manifest
File versionNot applicable
File size709
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_97906969ff7ba521367ba8a4ecb91492_31bf3856ad364e35_6.1.7601.21866_none_5de734ed64900f5b.manifest
File versionNot applicable
File size711
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_a3c24c92eae8d28602ee970cf0a54b16_31bf3856ad364e35_6.1.7601.17730_none_fe362fe6ee2da860.manifest
File versionNot applicable
File size1,042
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_b7824833a4340cc0bc3d0b7c7f471380_31bf3856ad364e35_6.1.7601.17730_none_cd232a870bc48095.manifest
File versionNot applicable
File size699
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_c6245ef6caa27d706f2b885da1bf9946_31bf3856ad364e35_6.1.7601.17730_none_084a17cb2cd864f7.manifest
File versionNot applicable
File size1,062
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_db44d21e36e57293a4d87460fa4e0bf2_31bf3856ad364e35_6.1.7601.17730_none_8438dcbb75acfda0.manifest
File versionNot applicable
File size709
Date (UTC)24-Nov-2011
Time (UTC)21:47
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17730_none_ca3cc9dbcad6697d.manifest
File versionNot applicable
File size15,291
Date (UTC)24-Nov-2011
Time (UTC)08:18
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21866_none_caabf89ee406f524.manifest
File versionNot applicable
File size15,291
Date (UTC)24-Nov-2011
Time (UTC)08:11
File nameAmd64_microsoft-windows-userpowermanagement_31bf3856ad364e35_6.1.7601.17730_none_0126069c138bb686.manifest
File versionNot applicable
File size3,073
Date (UTC)24-Nov-2011
Time (UTC)08:12
File nameAmd64_microsoft-windows-userpowermanagement_31bf3856ad364e35_6.1.7601.21866_none_0195355f2cbc422d.manifest
File versionNot applicable
File size3,073
Date (UTC)24-Nov-2011
Time (UTC)08:04

Properties

Article ID: 2645594 - Last Review: January 4, 2013 - Revision: 5.0
Applies to
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
Keywords: 
kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseinter atdownload kbautohotfix KB2645594

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