Startup takes a long time on a Windows 7 or Windows Server 2008 R2-based computer that has an Intel Nehalem-EX CPU installed

Not sure if this is the right fix? We've added this issue to our memory dump diagnostic which can confirm.

Symptoms

Consider the following scenario:

  • You have a computer that is running Windows 7 or Windows Server 2008 R2.

  • The computer has an Intel CPU installed. The CPU is code-named Nehalem-EX.

  • The CPU has four or more sockets.

In this scenario, it takes a long time to start the computer.

Cause

The issue occurs because Windows does not use the broadcast method to send an interprocessor interrupt (IPI) during startup. Therefore, some processor cores may be in a Deep C state and may take some time to resume. For example, some processor cores may be in the C3 state. This causes significant delays in the startup process.

Resolution

To resolve this problem, install the following hotfix. After you apply this hotfix, the broadcast method is used to send the IPI. Therefore, the IPI can complete much faster.

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 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.

Prerequisites

To apply this hotfix, your computer must be running Windows 7 or Windows Server 2008 R2.

Registry information

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

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) 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


Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • 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 maintaining the state of the updated component. 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

File name

File version

File size

Date

Time

Platform

Ntkrnlpa.exe

6.1.7600.20704

3,964,808

01-May-2010

20:38

Not Applicable

Ntoskrnl.exe

6.1.7600.20704

3,909,000

01-May-2010

20:38

Not Applicable

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Ntoskrnl.exe

6.1.7600.20704

5,478,272

01-May-2010

21:20

x64

Ntkrnlpa.exe

6.1.7600.20704

3,964,808

01-May-2010

20:38

Not Applicable

Ntoskrnl.exe

6.1.7600.20704

3,909,000

01-May-2010

20:38

Not Applicable

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Ntoskrnl.exe

6.1.7600.20704

11,106,688

01-May-2010

20:22

IA-64

Ntkrnlpa.exe

6.1.7600.20704

3,964,808

01-May-2010

20:38

Not Applicable

Ntoskrnl.exe

6.1.7600.20704

3,909,000

01-May-2010

20:38

Not 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 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

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

File name

Update.mum

File version

Not Applicable

File size

1,674

Date (UTC)

03-May-2010

Time (UTC)

14:42

Platform

Not Applicable

File name

X86_5d797ec801e350536690c56edb09184d_31bf3856ad364e35_6.1.7600.20704_none_1167fc52a692ad52.manifest

File version

Not Applicable

File size

697

Date (UTC)

03-May-2010

Time (UTC)

14:42

Platform

Not Applicable

File name

X86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20704_none_6ce5d9572e544639.manifest

File version

Not Applicable

File size

16,151

Date (UTC)

01-May-2010

Time (UTC)

21:18

Platform

Not Applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_500b57df2bf95e3cb888633a4c2884db_31bf3856ad364e35_6.1.7600.20704_none_4ade4352bc56a8b8.manifest

File version

Not Applicable

File size

701

Date (UTC)

03-May-2010

Time (UTC)

14:42

Platform

Not Applicable

File name

Amd64_5d797ec801e350536690c56edb09184d_31bf3856ad364e35_6.1.7600.20704_none_6d8697d65ef01e88.manifest

File version

Not Applicable

File size

699

Date (UTC)

03-May-2010

Time (UTC)

14:42

Platform

Not Applicable

File name

Amd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20704_none_c90474dae6b1b76f.manifest

File version

Not Applicable

File size

15,291

Date (UTC)

01-May-2010

Time (UTC)

22:19

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,906

Date (UTC)

03-May-2010

Time (UTC)

14:42

Platform

Not Applicable

File name

X86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20704_none_6ce5d9572e544639.manifest

File version

Not Applicable

File size

16,151

Date (UTC)

01-May-2010

Time (UTC)

21:18

Platform

Not Applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_5d797ec801e350536690c56edb09184d_31bf3856ad364e35_6.1.7600.20704_none_1169a048a690b64e.manifest

File version

Not Applicable

File size

698

Date (UTC)

03-May-2010

Time (UTC)

14:42

Platform

Not Applicable

File name

Ia64_846ef0a165f0ef3bb69827b0b6a2ad96_31bf3856ad364e35_6.1.7600.20704_none_d1fa9e3646736f31.manifest

File version

Not Applicable

File size

699

Date (UTC)

03-May-2010

Time (UTC)

14:42

Platform

Not Applicable

File name

Ia64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20704_none_6ce77d4d2e524f35.manifest

File version

Not Applicable

File size

15,289

Date (UTC)

01-May-2010

Time (UTC)

22:06

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,684

Date (UTC)

03-May-2010

Time (UTC)

14:42

Platform

Not Applicable

File name

X86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20704_none_6ce5d9572e544639.manifest

File version

Not Applicable

File size

16,151

Date (UTC)

01-May-2010

Time (UTC)

21:18

Platform

Not Applicable

References

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.

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