Microsoft KB Archive/237187

= XCON: MTA Performs Excessive Context Switching During Heavy Message Traffic =

Article ID: 237187

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q237187





SYMPTOMS
During heavy X.400 message traffic, the message transfer agent (MTA) may perform excessive context switching, which causes X.400 messages to be delivered more slowly through the Exchange Server computer. Context switching can be monitored using the following Performance Monitor counter:

Object: System

Counter: Context Switches/sec.



RESOLUTION
To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack



STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 3. When you apply the fix, the following registry key is created:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Messaging Subsystem\Applications\EMSMTA

The following registry value is created under the above key:

Value Name: UseMHEAPMgr

Data Type: REG_DWORD

Value: 1

Additional query words: throughput slow performance exchmem

Keywords: kbbug kbnofix KB237187

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