Microsoft KB Archive/811171

= Performance Problems with Olicom Token Ring Adapter After You Apply SP3 =

PSS ID Number: 811171

Article Last Modified on 5/29/2003

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The information in this article applies to:


 * Microsoft Windows 2000 Advanced Server SP3
 * Microsoft Windows 2000 Datacenter Server SP3
 * Microsoft Windows 2000 Professional SP3
 * Microsoft Windows 2000 Server SP3

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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
After you install Windows 2000 Service Pack 3 (SP3) on a server computer, you may experience performance problems. This issue occurs only when both your server and the clients accessing your server are connected to a token ring network and you are using an Olicom token ring network adapter. This issue does not occur when the clients use an Ethernet connection.



CAUSE
This issue may occur if you are not using the most current drivers for your Olicom token ring network adapter.



RESOLUTION
To resolve this issue, contact Olicom or Madge to obtain the most current drivers for your Olicom token ring network adapter. To do this, visit the following Olicom and Madge Web sites:

http://www.olicom.com

http://www.madge.com

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

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.



WORKAROUND
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.

To work around this issue, set the TCPDelAckTicks registry value on the server computer. This registry value specifies the number of 100-millisecond intervals to use for the delayed ACK timer on a per-interface basis. By default, the delayed ACK timer value is 200 milliseconds. If you set the TcpDelAckTicks value to 0, delayed acknowledgments are disabled. This setting causes the computer to immediately send an ACK packet for every packet that it receives.

Note Adapter-specific values are listed under subkeys for each adapter. Make sure that you add the TcpDelAckTicks value to the following registry key:

 

Do not add this value to the following registry key:

 
 * 1) Start Registry Editor.
 * 2) Locate and then click the following key in the registry, where  is the GUID for the network adapter that connects to the clients:

 
 * 1) On the Edit menu, click Add Value, and then add the following registry value:

Value name: TcpDelAckTicks

Data type: REG_DWORD

Value data: You can set this value to a range from 0 to 6. The default setting is 2 (200 milliseconds).
 * 1) Quit Registry Editor.
 * 2) Restart Windows for this change to take effect.

Additional query words: tokenring performance slow

Keywords: kbprb KB811171

Technology: kbwin2000AdvServ kbwin2000AdvServSearch kbWin2000AdvServSP3 kbwin2000DataServ kbwin2000DataServSearch kbWin2000DataServSP3 kbwin2000Pro kbwin2000ProSearch kbWin2000ProSP3 kbwin2000Search kbwin2000Serv kbwin2000ServSearch kbwin2000ServSP3 kbWinAdvServSearch kbWinDataServSearch

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