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You encounter a decrease in I/O performance under a heavy disk I/O load on a Windows Server 2008 R2-based or Windows 7-based computerArticle ID: 982383 - View products that this article applies to. On This PageSYMPTOMSThe performance of a computer that is running Windows Server 2008 R2 or Windows 7 decreases by 20 percent under a heavy disk I/O load. This issue usually occurs on a computer that has more than 8 processors. RESOLUTIONHotfix informationA 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.
(http://support.microsoft.com/contactus/?ws=support)
PrerequisitesTo apply this hotfix, you must be running Windows 7 or Windows Server 2008 R2.Registry informationTo use the hotfix in this package, you do not have to make any changes to the registry.Restart requirementYou must restart the computer after you apply this hotfix.Hotfix replacement informationThis hotfix does not replace a previously released hotfix.File informationThe 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 notesImportant 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.
For all supported x86-based versions of Windows 7Collapse this table
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2Collapse this table
For all supported IA-64-based versions of Windows Server 2008 R2Collapse this table
WORKAROUNDImportant This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 To work around this issue, add the following registry entry to the registry, and then set the value to 1:
(http://support.microsoft.com/kb/322756/
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How to back up and restore the registry in WindowsLocation: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\kernel Name: MaximumDpcQueueDepth Type: REG_DWORD Value: 1 STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. MORE INFORMATIONFor more information about the organization of the DPC queues, visit the following website: General information about the organization of the DPC queues
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://msdn.microsoft.com/en-us/library/ff558754.aspx)
824684
(http://support.microsoft.com/kb/824684/
)
Description of the standard terminology that is used to describe Microsoft software updates
Additional file informationAdditional file information for Windows 7 and for Windows Server 2008 R2Additional files for all supported x86-based versions of Windows 7Collapse this table
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2Collapse this table
Additional files for all supported IA-64-based versions of Windows Server 2008 R2Collapse this table
PropertiesArticle ID: 982383 - Last Review: June 10, 2010 - Revision: 2.0 APPLIES TO
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