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Windows 7 or Windows Server 2008 R2 stops responding when an application performs many I/O operations to a network shareArticle ID: 2582112 - View products that this article applies to. On This PageSYMPTOMSConsider the following scenario. You use an application to access a network share from a computer that is running Windows 7 or Windows Server 2008 R2. The application performs many I/O operations to the network share. In this scenario, Windows may stop responding. If you use the Memory Pool Monitor utility (Poolmon.exe) to troubleshoot this issue, you notice that the values of the AlMs and Powe tags increase and eventually consume all pool resources. Notes
CAUSEThis issue occurs because of a new behavior of the Server Message Block (SMB) mini-redirector (mrxsmb.sys) in Windows 7 and in Windows Server 2008 R2. In Windows 7 and Windows Server 2008 R2, a power request object is created and then destroyed for every SMB network file operation. When an application performs heavy I/O to the network share, many threads that read or write to the network share create many power request objects. Therefore, the Power service cannot process the power request objects as fast as they are generated. 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 one of the following operating systems:
976932
(http://support.microsoft.com/kb/976932/
)
Information about Service Pack 1 for Windows 7 and for 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 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 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
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 Memory Pool Monitor utility, click the following article number to view the article in the Microsoft Knowledge Base: 177415 For more information about the Poolmon.exe
command-line tool, visit the following Microsoft website:
(http://support.microsoft.com/kb/177415/
)
How to use Memory Pool Monitor (Poolmon.exe) to troubleshoot kernel mode memory leaksGeneral information about the Poolmon.exe
command-line tool
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://technet.microsoft.com/en-us/library/cc737099(WS.10).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
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use
(http://go.microsoft.com/fwlink/?LinkId=151500)
for other considerations.PropertiesArticle ID: 2582112 - Last Review: September 9, 2011 - Revision: 2.0 APPLIES TO
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