You experience disk I/O performance issues on a computer that has an Intel Westmere-EX processor with at least 8 sockets and that is running Windows Server 2008 R2

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SYMPTOMS

Consider the following scenario:
  • You install Windows Server 2008 R2 on a computer that has an Intel Westmere-EX processor with at least 8 sockets.
  • The computer is under a heavy disk I/O workload.
In this scenario, applications or services that run on the computer may experience poor performance.

CAUSE

The issue occurs because some I/O completion port objects are not cache-aligned. This behavior causes poor disk I/O performance.

RESOLUTION

The following hotfix can result in an approximate 26% increase in disk I/O performance.

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 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, you do not have to change 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 0.21xxxWindows 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) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. 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 x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntoskrnl.exe6.1.7600.168505,507,96816-Jul-201105:29x64
Ntoskrnl.exe6.1.7600.210105,474,68816-Jul-201105:28x64
Ntoskrnl.exe6.1.7601.176515,561,21616-Jul-201105:44x64
Ntoskrnl.exe6.1.7601.217725,561,72816-Jul-201105:34x64
Ntkrnlpa.exe6.1.7600.168503,957,12016-Jul-201104:40Not applicable
Ntoskrnl.exe6.1.7600.168503,902,33616-Jul-201104:40Not applicable
Ntkrnlpa.exe6.1.7600.210103,967,87216-Jul-201104:32Not applicable
Ntoskrnl.exe6.1.7600.210103,911,55216-Jul-201104:32Not applicable
Ntkrnlpa.exe6.1.7601.176513,967,87216-Jul-201104:31Not applicable
Ntoskrnl.exe6.1.7601.176513,912,57616-Jul-201104:31Not applicable
Ntkrnlpa.exe6.1.7601.217723,967,87216-Jul-201105:02Not applicable
Ntoskrnl.exe6.1.7601.217723,912,57616-Jul-201105:02Not applicable
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntoskrnl.exe6.1.7600.1685011,178,36816-Jul-201104:10IA-64
Ntoskrnl.exe6.1.7600.2101011,133,82416-Jul-201104:07IA-64
Ntoskrnl.exe6.1.7601.1765111,118,97616-Jul-201104:14IA-64
Ntoskrnl.exe6.1.7601.2177211,119,48816-Jul-201104:21IA-64
Ntkrnlpa.exe6.1.7600.168503,957,12016-Jul-201104:40Not applicable
Ntoskrnl.exe6.1.7600.168503,902,33616-Jul-201104:40Not applicable
Ntkrnlpa.exe6.1.7600.210103,967,87216-Jul-201104:32Not applicable
Ntoskrnl.exe6.1.7600.210103,911,55216-Jul-201104:32Not applicable
Ntkrnlpa.exe6.1.7601.176513,967,87216-Jul-201104:31Not applicable
Ntoskrnl.exe6.1.7601.176513,912,57616-Jul-201104:31Not applicable
Ntkrnlpa.exe6.1.7601.217723,967,87216-Jul-201105:02Not applicable
Ntoskrnl.exe6.1.7601.217723,912,57616-Jul-201105:02Not 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 Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_02cade8ee7cbb37dc2e9cb01a9be267e_31bf3856ad364e35_6.1.7600.21010_none_9ae0c9f8725f49de.manifest
File versionNot applicable
File size699
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_05d091a8a3077eb257f49a2169de0b6c_31bf3856ad364e35_6.1.7600.21010_none_d7b7987a8c8607cc.manifest
File versionNot applicable
File size721
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_0d9b87925d5ab475422e071b941f5463_31bf3856ad364e35_6.1.7601.17651_none_76dced67f3608bbd.manifest
File versionNot applicable
File size701
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_21b077700f91162dc1e550a09db8b961_31bf3856ad364e35_6.1.7600.16850_none_8b79990c5dbbd369.manifest
File versionNot applicable
File size699
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_223f1966dc94538717c6e2da9708c90c_31bf3856ad364e35_6.1.7600.16850_none_c3b626859634d3c3.manifest
File versionNot applicable
File size1,042
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_3552926e9edd357496372b851f68e1bb_31bf3856ad364e35_6.1.7600.16691_none_9a7046efb6fa0929.manifest
File versionNot applicable
File size721
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_5142ab0dbc22c4405eb7b289baa12f2c_31bf3856ad364e35_6.1.7601.21772_none_d294a9bb2aa35756.manifest
File versionNot applicable
File size1,042
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_5ebc4367d23ff4f4f91847abce1693da_31bf3856ad364e35_6.1.7600.21010_none_ff954f2a4bca10e3.manifest
File versionNot applicable
File size1,042
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_aef46835c273a0dfee530d514ad1766d_31bf3856ad364e35_6.1.7600.21010_none_41c1ea8c97da46bc.manifest
File versionNot applicable
File size701
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_b3c6561c4fb3283906a627186958c4e7_31bf3856ad364e35_6.1.7601.17651_none_d0e1652da33edee0.manifest
File versionNot applicable
File size699
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_c046cf398523d6639bcade9a76a8ed4f_31bf3856ad364e35_6.1.7600.16850_none_a94e847e724cbaef.manifest
File versionNot applicable
File size701
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_c1e3fe23d1707f2d7f88d2ee5de3ed97_31bf3856ad364e35_6.1.7601.21772_none_9b07bd0380f94803.manifest
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File size701
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_c96a1d33ceac89ab032122700ed3a60f_31bf3856ad364e35_6.1.7601.21772_none_d806ef0516250143.manifest
File versionNot applicable
File size699
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_ff851a0450731a42390b65164ae097bc_31bf3856ad364e35_6.1.7601.17651_none_0fe4e268a8032fe3.manifest
File versionNot applicable
File size1,042
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16850_none_c840cb17cdc0384c.manifest
File versionNot applicable
File size15,291
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Time (UTC)06:12
PlatformNot applicable
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.21010_none_c8f57fb4e6bd9b94.manifest
File versionNot applicable
File size15,291
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File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17651_none_ca282867cae5bd8f.manifest
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File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21772_none_ca9d25a4e412ae92.manifest
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Time (UTC)06:22
PlatformNot applicable
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Date (UTC)20-Oct-2010
Time (UTC)06:15
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File nameAmd64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.21010_none_e0c317a76102a62e.manifest
File versionNot applicable
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Date (UTC)16-Jul-2011
Time (UTC)05:48
PlatformNot applicable
File nameUpdate-bf.mum
File versionNot applicable
File size3,153
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16850_none_6c222f941562c716.manifest
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Time (UTC)05:06
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Date (UTC)16-Jul-2011
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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_02cade8ee7cbb37dc2e9cb01a9be267e_31bf3856ad364e35_6.1.7600.21010_none_3ec3d26ab9ffe1a4.manifest
File versionNot applicable
File size698
Date (UTC)18-Jul-2011
Time (UTC)19:45
PlatformNot applicable
File nameIa64_1dd3ef4f753a38b5e7637a72d2f00ede_31bf3856ad364e35_6.1.7600.16691_none_5fa51369c24cf8c3.manifest
File versionNot applicable
File size719
Date (UTC)18-Jul-2011
Time (UTC)19:45
PlatformNot applicable
File nameIa64_21b077700f91162dc1e550a09db8b961_31bf3856ad364e35_6.1.7600.16850_none_2f5ca17ea55c6b2f.manifest
File versionNot applicable
File size698
Date (UTC)18-Jul-2011
Time (UTC)19:45
PlatformNot applicable
File nameIa64_31a2a94f09ce72bd5b42e1ef81959845_31bf3856ad364e35_6.1.7601.21772_none_c401bb5521ecec75.manifest
File versionNot applicable
File size699
Date (UTC)18-Jul-2011
Time (UTC)19:45
PlatformNot applicable
File nameIa64_6d044bf39ae8b714e91e409c97d9a8d9_31bf3856ad364e35_6.1.7600.21010_none_ddb49f7f8b211e8a.manifest
File versionNot applicable
File size699
Date (UTC)18-Jul-2011
Time (UTC)19:45
PlatformNot applicable
File nameIa64_b3c6561c4fb3283906a627186958c4e7_31bf3856ad364e35_6.1.7601.17651_none_74c46d9feadf76a6.manifest
File versionNot applicable
File size698
Date (UTC)18-Jul-2011
Time (UTC)19:45
PlatformNot applicable
File nameIa64_c192f441b4c4be3ade9e04f683522ea1_31bf3856ad364e35_6.1.7600.16850_none_3d68899164e583c1.manifest
File versionNot applicable
File size699
Date (UTC)18-Jul-2011
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Date (UTC)18-Jul-2011
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File nameIa64_c96a1d33ceac89ab032122700ed3a60f_31bf3856ad364e35_6.1.7601.21772_none_7be9f7775dc59909.manifest
File versionNot applicable
File size698
Date (UTC)18-Jul-2011
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File nameIa64_f93bb35b22fd7424fab8a7db7b3c3acd_31bf3856ad364e35_6.1.7600.21010_none_53e0b69a849b3e11.manifest
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File size719
Date (UTC)18-Jul-2011
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File versionNot applicable
File size15,289
Date (UTC)16-Jul-2011
Time (UTC)05:57
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File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21772_none_6e802e172bb34658.manifest
File versionNot applicable
File size15,289
Date (UTC)16-Jul-2011
Time (UTC)06:14
PlatformNot applicable
File nameIa64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.16691_none_83c7284a8fc56979.manifest
File versionNot applicable
File size8,048
Date (UTC)20-Oct-2010
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File nameIa64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.21010_none_84a62019a8a33df4.manifest
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Date (UTC)16-Jul-2011
Time (UTC)05:39
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File nameUpdate-bf.mum
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File size2,128
Date (UTC)18-Jul-2011
Time (UTC)19:46
PlatformNot applicable
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.16850_none_6c222f941562c716.manifest
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Date (UTC)16-Jul-2011
Time (UTC)05:00
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File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.17651_none_6e098ce412884c59.manifest
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File size16,151
Date (UTC)16-Jul-2011
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File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21772_none_6e7e8a212bb53d5c.manifest
File versionNot applicable
File size16,151
Date (UTC)16-Jul-2011
Time (UTC)05:29
PlatformNot applicable

Properties

Article ID: 2545635 - Last Review: October 14, 2011 - Revision: 1.0
APPLIES TO
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Foundation
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix KB2545635

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