INFO: Registry Key to Improve Boot Performance on Some Multiprocessor Systems (823599)
The information in this article applies to:
- Microsoft Windows Server 2003, Datacenter Edition
- Microsoft Windows Server 2003, Enterprise Edition
- Microsoft Windows Server 2003, Standard Edition
- Microsoft Windows Server 2003, Web Edition
- Microsoft Windows Small Business Server 2003, Premium Edition
- Microsoft Windows Small Business Server 2003, Standard Edition
SUMMARYIf recommended by the original equipment manufacturer, you
can set the following registry key to use extended memory manager interface
(XMMI) memory zeroing on a
Pentium 4 multiprocessor platform. By default, the XMMI zero loop is
not used on Pentium 4 multiprocessor systems because of hardware issues that
result in a performance degradation when using the XMMI zero loop on many
Pentium 4 multiprocessor systems. Set the following registry key with
the value that is indicated: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session
Manager\Kernel For this key to work correctly, all the
following conditions must exist:
- XMMIZeroingEnable is present
- XMMIZeroingEnable is of type REG_DWORD
- XMMIZeroingEnable does not have a value of 0
Warning Do not use this setting unless specifically recommended by the OEM.
Performance improvements will be seen only on some specific machines. The third-party products that are
discussed in this article are manufactured by companies that are independent of
Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the
performance or reliability of these products.
| Modification Type: | Minor | Last Reviewed: | 12/27/2003 |
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| Keywords: | kbinfo KB823599 kbAudDeveloper |
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