Microsoft KB Archive/277990

= FIX: MSMQ Performance Degradation Occurs on Connector Application Computer =

Article ID: 277990

Article Last Modified on 2/19/2007

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APPLIES TO


 * Microsoft Message Queuing 2.0

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This article was previously published under Q277990



SYMPTOMS
A significant performance degradation occurs on fast multi-processor computers when large amounts of messages accumulate. The symptoms include:
 * Delivery performance degrades to as low as seven (7) messages per second.
 * Non-paged memory is consumed until the system stops responding and does not react to any interactive input.



CAUSE
When messages arrive at the connector computer, the storage for the messages is being allocated inefficiently. The computer GUID is being added to the message, which requires allocation of a new memory location to copy the message and the computer GUID. This double allocation not only slows message processing, but may also cause increased fragmentation of message storage.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:

  Date        Time    Version    Size     File name

10/31/2000 10:59a  5.0.0.715  278,800  Mq1repl.dll 10/25/2000 02:05p  5.0.0.715   14,096  Mq1sync.exe 10/25/2000 02:05p  5.0.0.715   71,408  Mqac.sys 10/31/2000 10:59a  5.0.0.715  214,288  Mqads.dll 10/25/2000 02:05p  5.0.0.715   21,776  Mqbkup.exe 10/31/2000 10:59a  5.0.0.715   29,456  Mqcertui.dll 10/31/2000 10:59a  5.0.0.715   49,424  Mqclus.dll 10/31/2000 10:59a  5.0.0.715   29,968  Mqdbodbc.dll 10/31/2000 10:59a  5.0.0.715   75,536  Mqdscli.dll 10/31/2000 10:59a  5.0.0.715   41,744  Mqdssrv.dll 10/25/2000 02:05p  5.0.0.715   98,064  Mqmig.exe 10/31/2000 10:59a  5.0.0.715  263,952  Mqmigrat.dll 10/31/2000 10:59a  5.0.0.715  223,504  Mqoa.dll 10/31/2000 10:59a  5.0.0.715    7,952  Mqperf.dll 10/31/2000 10:59a  5.0.0.715  409,872  Mqqm.dll 10/31/2000 10:59a  5.0.0.715    8,464  Mqrperf.dll 10/31/2000 10:59a  5.0.0.715   91,920  Mqrt.dll 10/31/2000 10:59a  5.0.0.715   70,416  Mqsec.dll 10/31/2000 10:59a  5.0.0.715  400,144  Mqsnap.dll 10/25/2000 02:05p  5.0.0.715   14,096  Mqsvc.exe 10/31/2000 10:59a  5.0.0.715   24,336  Mqupgrd.dll 10/31/2000 10:59a  5.0.0.715  107,792  Mqutil.dll 10/31/2000 10:59a  5.0.0.715   64,784  Msmq.cpl 10/31/2000 10:59a  5.0.0.715  159,504  Msmqocm.dll



WORKAROUND
A registry value has been added to allow MSMQ to allocate message buffers with an initial size for both the message and the additional computer GUID. You should only set this value on MSMQ computers with foreign sites (MSMQ Connector application computers). To enable this functionality, add the following Dword registry value and set it to &quot;1&quot;:

HKLM\Software\Microsoft\MSMQ\Parameters\AllocateMore



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 2.



MORE INFORMATION
For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Keywords: kbbug kbfix kbqfe kbwin2000presp2fix KB277990

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