Scalability of the I/O performance decreases in Windows Server 2008 R2 if more than 256 GB of physical memory is used

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Article ID: 2566205 - View products that this article applies to.
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Symptoms

On a computer that is running Windows Server 2008 R2 and that has more than 256 gigabytes (GB) of physical memory, the scalability of the I/O performance decreases.

If the computer has many processor cores and Peripheral Component Interconnect (PCI) Express slots, the scalability of the I/O performance decreases even more.

Cause

This issue occurs because the Memory Manager calculates a maximum value for the number of memory descriptor lists (MDLs) incorrectly.

Resolution

To resolve this issue, install the following hotfix package on the affected computer that is running Windows Server 2008 R2.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that 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 hotfix, you must be running one of the following operating systems:
  • Windows Server 2008 R2
  • 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 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, 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. 21xxxWindows Server 2008 R2RTMLDR
    6.1.760 1 . 21xxxWindows Server 2008 R2SP1LDR
  • 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 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.exe6.1.7600.210095,474,68815-Jul-201107:35x64
Ntoskrnl.exe6.1.7601.217715,561,72815-Jul-201105:24x64
Ntkrnlpa.exe6.1.7600.210093,967,87215-Jul-201107:34Not applicable
Ntoskrnl.exe6.1.7600.210093,911,55215-Jul-201107:34Not applicable
Ntkrnlpa.exe6.1.7601.217713,967,87215-Jul-201105:47Not applicable
Ntoskrnl.exe6.1.7601.217713,912,57615-Jul-201105:47Not applicable
For all supported IA-64–based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ntoskrnl.exe6.1.7600.2100911,133,82415-Jul-201107:24IA-64
Ntoskrnl.exe6.1.7601.2177111,119,48815-Jul-201104:14IA-64
Ntkrnlpa.exe6.1.7600.210093,967,87215-Jul-201107:34Not applicable
Ntoskrnl.exe6.1.7600.210093,911,55215-Jul-201107:34Not applicable
Ntkrnlpa.exe6.1.7601.217713,967,87215-Jul-201105:47Not applicable
Ntoskrnl.exe6.1.7601.217713,912,57615-Jul-201105:47Not 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_2b2e8e3478a758eb4c51736f5861f4e9_31bf3856ad364e35_6.1.7600.21009_none_c1eaa54c21637746.manifest
File versionNot applicable
File size721
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameAmd64_30a029c829fe8a28225adb5bb03a6b8e_31bf3856ad364e35_6.1.7600.21009_none_5a5f31ffe6b00a4a.manifest
File versionNot applicable
File size1,042
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameAmd64_5905c87c80321e20d0926f91e31b8a75_31bf3856ad364e35_6.1.7600.21009_none_22fe56748d6f8283.manifest
File versionNot applicable
File size699
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameAmd64_7ea25ec54fb0d189cc15b963620c6e83_31bf3856ad364e35_6.1.7601.21771_none_199ee142e36cab4a.manifest
File versionNot applicable
File size701
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameAmd64_96cacba881c3038c0afde6301f9ec16d_31bf3856ad364e35_6.1.7601.21771_none_9643c3f4195206a8.manifest
File versionNot applicable
File size699
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameAmd64_a4d2fb3d6b6354a96cd1afbc301c7e25_31bf3856ad364e35_6.1.7600.21009_none_7a3361d62ba7403d.manifest
File versionNot applicable
File size701
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameAmd64_be2d942a41d23e3500e7fda8f6812a53_31bf3856ad364e35_6.1.7601.21771_none_cc7168dad4b06ed3.manifest
File versionNot applicable
File size1,042
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.21009_none_c909523ae6ad63b2.manifest
File versionNot applicable
File size15,291
Date (UTC)15-Jul-2011
Time (UTC)08:52
File nameAmd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21771_none_ca9c255ae413953b.manifest
File versionNot applicable
File size15,291
Date (UTC)15-Jul-2011
Time (UTC)07:05
File nameAmd64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.21009_none_e0d6ea2d60f26e4c.manifest
File versionNot applicable
File size8,049
Date (UTC)15-Jul-2011
Time (UTC)08:40
File namePackage_for_kb2566205_sp1~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot applicable
File size2,412
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.21009_none_6ceab6b72e4ff27c.manifest
File versionNot applicable
File size16,151
Date (UTC)15-Jul-2011
Time (UTC)08:01
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21771_none_6e7d89d72bb62405.manifest
File versionNot applicable
File size16,151
Date (UTC)15-Jul-2011
Time (UTC)06:16
Additional files for all supported IA-64–based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_5905c87c80321e20d0926f91e31b8a75_31bf3856ad364e35_6.1.7600.21009_none_c6e15ee6d5101a49.manifest
File versionNot applicable
File size698
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameIa64_5d332dabbe19ceb3c221a9d607d85a31_31bf3856ad364e35_6.1.7601.21771_none_d762c070bfeb1b63.manifest
File versionNot applicable
File size699
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameIa64_96cacba881c3038c0afde6301f9ec16d_31bf3856ad364e35_6.1.7601.21771_none_3a26cc6660f29e6e.manifest
File versionNot applicable
File size698
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameIa64_c9592e60ad09dba3839250270f54085d_31bf3856ad364e35_6.1.7600.21009_none_7bcfa5d1744f60a0.manifest
File versionNot applicable
File size699
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameIa64_ef03abacd8bf369d143061f185f8a7ff_31bf3856ad364e35_6.1.7600.21009_none_c9c5af6ba9a3f7cd.manifest
File versionNot applicable
File size719
Date (UTC)15-Jul-2011
Time (UTC)18:49
File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.21009_none_6cec5aad2e4dfb78.manifest
File versionNot applicable
File size15,289
Date (UTC)15-Jul-2011
Time (UTC)08:47
File nameIa64_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21771_none_6e7f2dcd2bb42d01.manifest
File versionNot applicable
File size15,289
Date (UTC)15-Jul-2011
Time (UTC)07:27
File nameIa64_microsoft-windows-r..gistry-trustedtypes_31bf3856ad364e35_6.1.7600.21009_none_84b9f29fa8930612.manifest
File versionNot applicable
File size8,048
Date (UTC)15-Jul-2011
Time (UTC)08:39
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7600.21009_none_6ceab6b72e4ff27c.manifest
File versionNot applicable
File size16,151
Date (UTC)15-Jul-2011
Time (UTC)08:01
File nameX86_microsoft-windows-os-kernel_31bf3856ad364e35_6.1.7601.21771_none_6e7d89d72bb62405.manifest
File versionNot applicable
File size16,151
Date (UTC)15-Jul-2011
Time (UTC)06:16

Properties

Article ID: 2566205 - Last Review: December 27, 2012 - Revision: 2.0
Applies to
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseinter KB2566205

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