Performance is slow on a multiprocessor computer that is running Windows Server 2008 or Windows Vista

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Symptoms

You encounter one of the following issues on a multiprocessor computer that is running Windows Server 2008 or Windows Vista:

Issue one

Performance is slow if the number of processors is greater than 64.

Issue two

Only half of the processors are started. For example, 12 processors are started on a computer that has 24 processors.

Cause

Cause of issue one

Windows Server 2008 and Windows Vista assume that the number of processors in the computer should not be greater than 64. If the number of processors is greater than 64, Windows turns off non-uniform memory access (NUMA) optimization and runs in symmetric multiprocessor (SMP) mode. Therefore, performance is slow.

Cause of issue two

Windows Server 2008 and Windows Vista assume one or more physical processors per NUMA node. However, this assumption may be incorrect because of recent processor innovations such as multichip modules. Therefore, Windows incorrectly calculates the number of processors.

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 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=supportNote 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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix, the computer must run one of the following:

  • Windows Vista Service Pack 1

  • Windows Vista Service Pack 2

  • Windows Server 2008

  • Windows Server 2008 Service Pack 2

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information


This hotfix does not replace any other previously released hotfixes.

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 and Windows Vista file information note


The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are
listed separatelyMUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and Windows Vista

File name

File version

File size

Date

Time

Halacpi.dll

6.0.6001.22462

139,336

03-Jul-2009

13:27

Halmacpi.dll

6.0.6001.22462

174,680

03-Jul-2009

13:27

Halacpi.dll

6.0.6002.22163

139,336

03-Jul-2009

13:09

Halmacpi.dll

6.0.6002.22163

175,688

03-Jul-2009

13:09

Ntkrnlpa.exe

6.0.6001.22462

3,599,960

03-Jul-2009

13:27

Not Applicable

Ntoskrnl.exe

6.0.6001.22462

3,547,720

03-Jul-2009

13:27

Not Applicable

Ntkrnlpa.exe

6.0.6002.22163

3,599,928

03-Jul-2009

13:09

Not Applicable

Ntoskrnl.exe

6.0.6002.22163

3,548,232

03-Jul-2009

13:09

Not Applicable

For all supported Itanium-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Hal.dll

6.0.6001.22462

230,488

03-Jul-2009

13:59

Hal.dll

6.0.6002.22163

231,992

03-Jul-2009

13:15

Ntoskrnl.exe

6.0.6001.22462

4,682,328

03-Jul-2009

14:00

Ntoskrnl.exe

6.0.6002.22163

4,693,048

03-Jul-2009

13:15

For all supported x64-based versions of Windows Server 2008 and Windows Vista

File name

File version

File size

Date

Time

Hal.dll

6.0.6001.22462

427,096

03-Jul-2009

14:01

Hal.dll

6.0.6002.22163

428,104

03-Jul-2009

12:58

Ntoskrnl.exe

6.0.6001.22462

9,483,352

03-Jul-2009

14:01

Ntoskrnl.exe

6.0.6002.22163

9,461,816

03-Jul-2009

12:58

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 NUMA, visit the following Microsoft Web site:

http://msdn.microsoft.com/en-us/library/aa363804.aspxFor 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


Additional file information for Windows Server 2008 and Windows Vista

Additional files for all supported x86-based versions of Windows Server 2008 and Windows Vista

File name

File version

File size

Date

Time

Package_1_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

10,152

03-Jul-2009

22:16

Package_1_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

2,468

03-Jul-2009

21:57

Package_2_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

10,167

03-Jul-2009

22:16

Package_2_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

2,635

03-Jul-2009

21:57

Package_3_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

10,152

03-Jul-2009

22:16

Package_3_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

2,473

03-Jul-2009

21:57

Package_4_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

10,152

03-Jul-2009

22:16

Package_4_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

2,475

03-Jul-2009

21:57

Package_5_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

10,152

03-Jul-2009

22:16

Package_5_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

3,125

03-Jul-2009

21:57

Package_6_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

10,152

03-Jul-2009

22:16

Package_6_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

2,963

03-Jul-2009

21:57

Package_7_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

10,152

03-Jul-2009

22:16

Package_7_for_kb969468~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

2,963

03-Jul-2009

21:57

Package_for_kb969468_client_1~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_client_1~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,367

03-Jul-2009

21:57

Package_for_kb969468_client_2~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_client_2~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,694

03-Jul-2009

21:57

Package_for_kb969468_client~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_client~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,713

03-Jul-2009

21:57

Package_for_kb969468_sc_0~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_sc_0~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,422

03-Jul-2009

21:57

Package_for_kb969468_sc_1~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_sc_1~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,690

03-Jul-2009

21:57

Package_for_kb969468_sc~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_sc~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,701

03-Jul-2009

21:57

Package_for_kb969468_server_0~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_server_0~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,425

03-Jul-2009

21:57

Package_for_kb969468_server_1~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_server_1~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,694

03-Jul-2009

21:57

Package_for_kb969468_server~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_server~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,713

03-Jul-2009

21:57

Package_for_kb969468_winpesrv_0~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_winpesrv_0~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,422

03-Jul-2009

21:57

Package_for_kb969468_winpesrv~31bf3856ad364e35~x86~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:16

Package_for_kb969468_winpesrv~31bf3856ad364e35~x86~~6.0.4.0.mum

Not Applicable

1,430

03-Jul-2009

21:57

X86_3b00fb8da6f3c2bd0734bafb9015ef60_31bf3856ad364e35_6.0.6001.22462_none_668172404c3838a1.manifest

Not Applicable

697

03-Jul-2009

21:57

X86_4f76691a41b837fc50aa8c13189413b9_31bf3856ad364e35_6.0.6002.22163_none_ac04a3b83406c97a.manifest

Not Applicable

697

03-Jul-2009

21:57

X86_hal.inf_31bf3856ad364e35_6.0.6001.22462_none_0366d3b4213bd523.manifest

Not Applicable

2,244

03-Jul-2009

22:04

X86_hal.inf_31bf3856ad364e35_6.0.6002.22163_none_054e45e61e61439e.manifest

Not Applicable

2,244

03-Jul-2009

22:04

X86_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6001.22462_none_6c7b2529cd6f83fb.manifest

Not Applicable

17,806

03-Jul-2009

14:57

X86_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6002.22163_none_6e62975bca94f276.manifest

Not Applicable

17,806

03-Jul-2009

14:56

Additional files for all supported Itanium-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Ia64_bfec86bdd6948df96b9fd58cf3a8de16_31bf3856ad364e35_6.0.6001.22462_none_b4ef1f8b5f67e537.manifest

Not Applicable

699

03-Jul-2009

21:57

Ia64_df23a8862d3027105518daa9aef368bb_31bf3856ad364e35_6.0.6002.22163_none_407500d353496413.manifest

Not Applicable

699

03-Jul-2009

21:57

Ia64_hal.inf_31bf3856ad364e35_6.0.6001.22462_none_036877aa2139de1f.manifest

Not Applicable

1,655

03-Jul-2009

21:58

Ia64_hal.inf_31bf3856ad364e35_6.0.6002.22163_none_054fe9dc1e5f4c9a.manifest

Not Applicable

1,655

03-Jul-2009

21:58

Ia64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6001.22462_none_6c7cc91fcd6d8cf7.manifest

Not Applicable

16,819

03-Jul-2009

14:48

Ia64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6002.22163_none_6e643b51ca92fb72.manifest

Not Applicable

16,819

03-Jul-2009

13:44

Package_1_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

9,455

03-Jul-2009

22:01

Package_1_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

2,475

03-Jul-2009

21:57

Package_2_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

9,440

03-Jul-2009

22:01

Package_2_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

2,480

03-Jul-2009

21:57

Package_3_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

9,440

03-Jul-2009

22:01

Package_3_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

2,480

03-Jul-2009

21:57

Package_4_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

9,455

03-Jul-2009

22:01

Package_4_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

2,807

03-Jul-2009

21:57

Package_5_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

9,440

03-Jul-2009

22:01

Package_5_for_kb969468~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

2,807

03-Jul-2009

21:57

Package_for_kb969468_sc_0~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

7,583

03-Jul-2009

22:01

Package_for_kb969468_sc_0~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

1,425

03-Jul-2009

21:57

Package_for_kb969468_sc_1~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:01

Package_for_kb969468_sc_1~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

1,530

03-Jul-2009

21:57

Package_for_kb969468_sc~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:01

Package_for_kb969468_sc~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

1,706

03-Jul-2009

21:57

Package_for_kb969468_server_0~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

7,583

03-Jul-2009

22:01

Package_for_kb969468_server_0~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

1,429

03-Jul-2009

21:57

Package_for_kb969468_server_1~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:01

Package_for_kb969468_server_1~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

1,534

03-Jul-2009

21:57

Package_for_kb969468_server~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:01

Package_for_kb969468_server~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

1,718

03-Jul-2009

21:57

Package_for_kb969468_winpesrv_0~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

7,583

03-Jul-2009

22:01

Package_for_kb969468_winpesrv_0~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

1,426

03-Jul-2009

21:57

Package_for_kb969468_winpesrv~31bf3856ad364e35~ia64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:01

Package_for_kb969468_winpesrv~31bf3856ad364e35~ia64~~6.0.4.0.mum

Not Applicable

1,434

03-Jul-2009

21:57

Additional files for all supported x64-based versions of Windows Server 2008 and Windows Vista

File name

File version

File size

Date

Time

Amd64_141d8942c633543f2b569536fcc87c85_31bf3856ad364e35_6.0.6002.22163_none_3f06b26876979c44.manifest

Not Applicable

701

03-Jul-2009

21:58

Amd64_4a695f1edc0bf1bb97702a40a5fc2299_31bf3856ad364e35_6.0.6001.22462_none_3749602d5687f276.manifest

Not Applicable

701

03-Jul-2009

21:58

Amd64_hal.inf_31bf3856ad364e35_6.0.6001.22462_none_5f856f37d9994659.manifest

Not Applicable

1,656

03-Jul-2009

22:19

Amd64_hal.inf_31bf3856ad364e35_6.0.6002.22163_none_616ce169d6beb4d4.manifest

Not Applicable

1,656

03-Jul-2009

22:19

Amd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6001.22462_none_c899c0ad85ccf531.manifest

Not Applicable

16,512

03-Jul-2009

15:01

Amd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6002.22163_none_ca8132df82f263ac.manifest

Not Applicable

16,512

03-Jul-2009

14:56

Package_1_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

9,455

03-Jul-2009

22:21

Package_1_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

2,482

03-Jul-2009

21:57

Package_2_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

9,455

03-Jul-2009

22:21

Package_2_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

2,651

03-Jul-2009

21:58

Package_3_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

9,440

03-Jul-2009

22:21

Package_3_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

2,487

03-Jul-2009

21:58

Package_4_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

9,455

03-Jul-2009

22:21

Package_4_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

2,489

03-Jul-2009

21:58

Package_5_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

9,455

03-Jul-2009

22:21

Package_5_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

3,147

03-Jul-2009

21:58

Package_6_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

9,455

03-Jul-2009

22:21

Package_6_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

2,983

03-Jul-2009

21:58

Package_7_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

9,440

03-Jul-2009

22:21

Package_7_for_kb969468~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

2,983

03-Jul-2009

21:58

Package_for_kb969468_client_1~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:21

Package_for_kb969468_client_1~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,375

03-Jul-2009

21:58

Package_for_kb969468_client_2~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:21

Package_for_kb969468_client_2~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,706

03-Jul-2009

21:58

Package_for_kb969468_client~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:21

Package_for_kb969468_client~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,723

03-Jul-2009

21:58

Package_for_kb969468_sc_0~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:21

Package_for_kb969468_sc_0~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,430

03-Jul-2009

21:58

Package_for_kb969468_sc_1~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,583

03-Jul-2009

22:21

Package_for_kb969468_sc_1~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,702

03-Jul-2009

21:58

Package_for_kb969468_sc~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,583

03-Jul-2009

22:21

Package_for_kb969468_sc~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,711

03-Jul-2009

21:58

Package_for_kb969468_server_0~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:21

Package_for_kb969468_server_0~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,433

03-Jul-2009

21:58

Package_for_kb969468_server_1~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,583

03-Jul-2009

22:21

Package_for_kb969468_server_1~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,706

03-Jul-2009

21:58

Package_for_kb969468_server~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,583

03-Jul-2009

22:21

Package_for_kb969468_server~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,723

03-Jul-2009

21:58

Package_for_kb969468_winpesrv_0~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,583

03-Jul-2009

22:21

Package_for_kb969468_winpesrv_0~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,430

03-Jul-2009

21:57

Package_for_kb969468_winpesrv~31bf3856ad364e35~amd64~~6.0.4.0.cat

Not Applicable

7,568

03-Jul-2009

22:21

Package_for_kb969468_winpesrv~31bf3856ad364e35~amd64~~6.0.4.0.mum

Not Applicable

1,438

03-Jul-2009

21:58

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