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You may experience memory performance issues on a Windows Server 2003-based computer that is using an Intel Pentium 4 multiprocessorArticle ID: 897335 - View products that this article applies to. Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base: 256986
(http://support.microsoft.com/kb/256986/
)
Description of the Microsoft Windows registryOn This PageSYMPTOMSOn a Microsoft Windows Server 2003-based computer that is using an Intel Pentium 4 multiprocessor, you may experience the following issues:
CAUSEWhen a process allocates virtual memory, the Windows memory
manager will clear the virtual memory pages before the memory manager lets the
requesting process access the pages. This step makes sure that a process cannot access data in virtual
memory that was previously owned by another process. The page zeroing thread that is responsible for cleaning used memory pages is configured to use one of two instruction sets early in the startup process. By default, the page zeroing thread is configured not to use the extended memory manager interface (XMMI) instruction set on Pentium 4 multiprocessor systems. This restriction exists because of hardware issues that cause a decrease in performance on many Pentium 4 multiprocessor systems. Under certain conditions, the XMMI instruction set is incorrectly selected. This issue may be more common on single processor virtual machines that run on multiprocessor hosts. A virtual machine may incorrectly select the zeroing loop because the virtual machine detects a single processor during startup on a multiprocessor host. RESOLUTIONService pack informationTo resolve this problem, obtain the latest service pack for Windows Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:889100
(http://support.microsoft.com/kb/889100/
)
How to obtain the latest service pack for Windows Server 2003Hotfix 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 this specific problem. 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)
PrerequisitesNo prerequisites are required.Restart requirementYou must restart the computer after you apply this hotfix.Hotfix replacement informationThis hotfix does not replace any other hotfixes.File informationThe English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.Windows Server 2003, x86-based versionsDate Time Version Size File name -------------------------------------------------------------- 14-Apr-2005 03:58 5.2.3790.309 2,407,936 Ntkrnlmp.exe 14-Apr-2005 00:43 5.2.3790.309 2,064,896 Ntkrnlpa.exe 14-Apr-2005 00:43 5.2.3790.309 2,110,464 Ntkrpamp.exe 14-Apr-2005 03:40 5.2.3790.309 2,208,768 Ntoskrnl.exe Windows Server 2003 with Service Pack 1 (SP1), x86-based versionsDate Time Version Size File name -------------------------------------------------------------- 14-Apr-2005 03:46 5.2.3790.2421 2,452,480 Ntkrnlmp.exe 14-Apr-2005 06:52 5.2.3790.2421 2,266,624 Ntkrnlpa.exe 14-Apr-2005 03:26 5.2.3790.2421 2,306,560 Ntkrpamp.exe 14-Apr-2005 03:46 5.2.3790.2421 2,414,592 Ntoskrnl.exe Windows Server 2003, Enterprise Edition for Itanium-based versionsDate Time Version Size File name -------------------------------------------------------------- 14-Apr-2005 06:53 5.2.3790.309 5,607,424 Ntkrnlmp.exe IA-64 Windows Server 2003 with SP1, Enterprise Edition for Itanium-based SystemsDate Time Version Size File name -------------------------------------------------------------- 14-Apr-2005 06:53 5.2.3790.2421 6,476,288 Ntkrnlmp.exe IA-64 Windows Server 2003, x64-based versionsDate Time Version Size File name -------------------------------------------------------------- 14-Apr-2005 06:53 5.2.3790.2421 4,416,000 Ntkrnlmp.exe 14-Apr-2005 06:53 5.2.3790.2421 4,443,648 Ntoskrnl.exe STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows Server 2003 Service Pack 2. MORE INFORMATIONWarning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk. After you install the hotfix, follow these steps:
824684
(http://support.microsoft.com/kb/824684/
)
Description of the standard terminology that is used to describe
Microsoft software updates
Technical support for Windows x64 editionsYour hardware manufacturer provides technical support and assistance for Microsoft Windows x64 editions. Your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation with unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with your Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware.For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site: http://www.microsoft.com/windowsxp/64bit/default.mspx For product information about Microsoft Windows Server 2003 x64 editions, visit the following Microsoft Web site:
(http://www.microsoft.com/windowsxp/64bit/default.mspx)
http://www.microsoft.com/windowsserver2003/64bit/x64/editions.mspx
(http://www.microsoft.com/windowsserver2003/64bit/x64/editions.mspx)
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products. PropertiesArticle ID: 897335 - Last Review: September 11, 2011 - Revision: 3.0 APPLIES TO
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