Microsoft KB Archive/246463

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Slow Network Throughput with Some Third-Party Programs

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The information in this article applies to:


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional

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SYMPTOMS
When you run a program that takes output from a different server across the network, it may take an extremely long time to complete. For example, Jetform would take output from a SAP server to reformat it for printing. Normally this would occur in 3 seconds, but now it may need over 1 hour to complete.

CAUSE
This problem can occur because the redirector cannot use full caching for "write only" opens. The third-party program mentioned earlier in this article does "write only" opens on a remote file, and it also does one byte writes (or writes in very small amounts). Both of these lead to a deterioration in performance because the redirector cannot use full caching for "write only" opens.

RESOLUTION
To enable the redirector to utilize full caching, use Registry Editor to view the following registry key, and then change the value of the EnableCachingOnWriteOnlyOpens REG_DWORD value to 1:

"HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanWorkStation\Parameters\EnableCachingOnWriteOnlyOpens" NOTE: The default setting is 0.

STATUS
Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

MORE INFORMATION
The third-party products discussed in this article are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words:

Keywords : kb3rdparty kbinterop kbnetwork kbprint

Version : WINDOWS:2000

Platform : WINDOWS

Issue type : kbprb

Technology :