Performance issues when more than 64 logical processors are used in Windows Server 2008 R2

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Article ID: 2510206 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You install Windows Server 2008 R2 on a computer that has more than 64 logical processors.
  • You run an application or service that is not aware of K-Group assignments or of the processor affinity on the computer.
In this scenario, performance issues may occur in the application or service.

CAUSE

This issue occurs because the group assignment algorithm does not create a balanced group assignment.

For example, a 4-socket computer that has 80 logical processors assigns 20 logical processors to one K-Group and 60 logical processors to another K-Group.

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 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

To apply this hotfix, you must be running Windows Server 2008 R2 or 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 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 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 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 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 0.16xxxWindows Server 2008 R2RTMGDR
    6.1.760 0.20xxxWindows Server 2008 R2RTMLDR
    6.1.760 1.17xxxWindows Server 2008 R2SP1GDR
    6.1.760 1.21xxxWindows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical 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" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical 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 x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntoskrnl.exe6.1.7600.167705,509,50401-Mar-201108:19x64
Ntoskrnl.exe6.1.7600.209125,475,20001-Mar-201108:13x64
Ntoskrnl.exe6.1.7601.175685,561,72801-Mar-201108:14x64
Ntoskrnl.exe6.1.7601.216715,561,72801-Mar-201108:22x64
Ntkrnlpa.exe6.1.7600.167703,957,63201-Mar-201108:19Not applicable
Ntoskrnl.exe6.1.7600.167703,901,82401-Mar-201108:19Not applicable
Ntkrnlpa.exe6.1.7600.209123,966,84801-Mar-201108:13Not applicable
Ntoskrnl.exe6.1.7600.209123,911,55201-Mar-201108:13Not applicable
Ntkrnlpa.exe6.1.7601.175683,967,36001-Mar-201108:09Not applicable
Ntoskrnl.exe6.1.7601.175683,911,04001-Mar-201108:09Not applicable
Ntkrnlpa.exe6.1.7601.216713,967,36001-Mar-201108:14Not applicable
Ntoskrnl.exe6.1.7601.216713,911,04001-Mar-201108:14Not 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:
2506384 How to manually configure K-Group assignment on multi processor machines.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2028687 You cannot specify a NUMA node when you create a process by using the "start" command in Windows Server 2008 R2 or in Windows 7
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 following table provides more information about the products or tools that automatically check for this condition on your instance of SQL Server and on the versions of the SQL Server product against which the rule is evaluated.

Collapse this tableExpand this table
Rule softwareRule title Rule descriptionProduct versions against which the rule is evaluated
System Center AdvisorWindows operating system missing update KB2510206 to prevent performance issues when computer has more than 64 processorsSystem Center Advisor determines whether SQL Server 2008 is running on a server that has more than 64 logical processors. In addition, advisor checks the current build and version of ntoskrnl.exe. If the current build of ntoskrnl.exe is less than the fix build, the advisor generates the alert about this issue. Review the details that are provided in the "Information Collected" section of the advisor alert, and apply the fix that is discussed in this article.  SQL Server 2008

Windows Server 2008 R2  

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_47d437dba0f9ca4678286be88b749e25_31bf3856ad364e35_6.1.7600.20912_none_f47d468d02fdfe68.manifest
File versionNot applicable
File size699
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_56405d19121d6957dee5daaaec3cdbb2_31bf3856ad364e35_6.1.7601.17568_none_7249a555813a3304.manifest
File versionNot applicable
File size1,042
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_62503180a10242b3bb972c5359a10847_31bf3856ad364e35_6.1.7600.20912_none_bd7aad30fa9c9c8f.manifest
File versionNot applicable
File size1,042
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_72e5174607291b294dd65f5b882fec13_31bf3856ad364e35_6.1.7600.20912_none_b03674e73f128b82.manifest
File versionNot applicable
File size721
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_83e3be9b3d318e7e3e82f0ecf29d8168_31bf3856ad364e35_6.1.7601.21671_none_aff694070bbde1d6.manifest
File versionNot applicable
File size701
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_8703f1ff416dadfe3a51e34763f66c77_31bf3856ad364e35_6.1.7601.21671_none_73fa6e1801bc4cf6.manifest
File versionNot applicable
File size1,042
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_97ae85c79b3aafa5e631f1051f0deaf8_31bf3856ad364e35_6.1.7601.21671_none_1ed8a28d6f781f06.manifest
File versionNot applicable
File size699
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_a9644494562c90bbb314165c45bb2204_31bf3856ad364e35_6.1.7601.17568_none_81590a2f6e7235a1.manifest
File versionNot applicable
File size701
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_b279944f327b098881e6e540de407ae7_31bf3856ad364e35_6.1.7601.17568_none_54ac0e352617b1e8.manifest
File versionNot applicable
File size699
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_b27a8289aa62b793bd8725c901930298_31bf3856ad364e35_6.1.7600.16695_none_c72f26069941735a.manifest
File versionNot applicable
File size721
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_d02123402fed5a3544b1eb3e8768cb1e_31bf3856ad364e35_6.1.7600.16770_none_1b5d19fbf374ced1.manifest
File versionNot applicable
File size701
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_deb3508879e7144b8afe8d5fc6039e2f_31bf3856ad364e35_6.1.7600.20912_none_b17c46c335190930.manifest
File versionNot applicable
File size701
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_e95c302ba93643950ef7ceb033c2d735_31bf3856ad364e35_6.1.7600.16770_none_fa60b5de93ba59b5.manifest
File versionNot applicable
File size699
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_efb4fd826026f5ffb15f75972ba05398_31bf3856ad364e35_6.1.7600.16770_none_8a9c1fdaeeb0e202.manifest
File versionNot applicable
File size1,042
Date (UTC)01-Mar-2011
Time (UTC)22:19
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16770_none_c82b2959cdd07307.manifest
File versionNot applicable
File size15,291
Date (UTC)01-Mar-2011
Time (UTC)09:47
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20912_none_c8f7a826e6bb9b00.manifest
File versionNot applicable
File size15,291
Date (UTC)01-Mar-2011
Time (UTC)09:42
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17568_none_ca24589bcae78dba.manifest
File versionNot applicable
File size15,291
Date (UTC)01-Mar-2011
Time (UTC)09:43
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21671_none_ca9c2374e4139814.manifest
File versionNot applicable
File size15,291
Date (UTC)01-Mar-2011
Time (UTC)09:44
PlatformNot applicable
File nameAmd64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.16695_none_dfe821004821370f.manifest
File versionNot applicable
File size8,049
Date (UTC)27-Oct-2010
Time (UTC)06:02
PlatformNot applicable
File nameAmd64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.20912_none_e0c540196100a59a.manifest
File versionNot applicable
File size8,049
Date (UTC)01-Mar-2011
Time (UTC)09:30
PlatformNot applicable
File nameUpdate-bf.mum
File versionNot applicable
File size3,153
Date (UTC)01-Mar-2011
Time (UTC)22:20
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16770_none_6c0c8dd6157301d1.manifest
File versionNot applicable
File size16,151
Date (UTC)01-Mar-2011
Time (UTC)08:57
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.20912_none_6cd90ca32e5e29ca.manifest
File versionNot applicable
File size16,151
Date (UTC)01-Mar-2011
Time (UTC)08:49
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17568_none_6e05bd18128a1c84.manifest
File versionNot applicable
File size16,151
Date (UTC)01-Mar-2011
Time (UTC)08:44
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21671_none_6e7d87f12bb626de.manifest
File versionNot applicable
File size16,151
Date (UTC)01-Mar-2011
Time (UTC)08:51
PlatformNot applicable

Properties

Article ID: 2510206 - Last Review: December 16, 2011 - Revision: 3.0
APPLIES TO
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbexpertiseadvanced kbsurveynew KB2510206

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