"Initial Memory Percentage" registry value has no effect (810883)


The information in this article applies to:

  • Microsoft Exchange 2000 Server
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

When the Initial Memory Percentage registry value is put in place to change the default memory allocation that is used for the Exchmem heaps, the initial memory heap size that is used by Exchange 2000 Server may not change.

CAUSE

This problem occurs because of an issue in the code for the Exchmem component that ignores the Initial Memory Percentage registry setting.

RESOLUTION

Cumulative Patch Information

To resolve this problem, obtain the March 2003 Exchange 2000 Server Post-Service Pack 3 (SP3) Rollup. For additional information about how to do so, click the following article number to view the article in the Microsoft Knowledge Base:

813840 XGEN: March 2003 Exchange 2000 Server Post-Service Pack 3 (S813840) Rollup

Hotfix Information

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft Exchange 2000 Server service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The Global version of this fix has the file attributes (or later) 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.
   Date         Time   Version            Size    File name
   ----------------------------------------------------------
   03-Dec-2002  20:09  6.0.6375.0         28,672  Exchmem.dll

STATUS

Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server.

MORE INFORMATION

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
This setting is useful when you are tuning an Exchange 2000 Server computer because of virtual memory fragmentation issues. Only use this method after the correct diagnosis has been made. Adding this value changes the amount of memory that is initially allocated for the Exchmem heaps, dropping it to 10 percent of physical memory. To do this, create the Initial Memory Percentage registry value in the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem

Value type: REG_DWORD
Value name: Initial Memory Percentage
Value data: 0xa

This reduces the default allocation to 10 percent of RAM.
Modification Type:MinorLast Reviewed:2/1/2006
Keywords:kbHotfixServer kbQFE kbenv kbprb kbQFE kbfix kbExchange2000preSP4fix kbbug KB810883
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