TCB Hash Function Modified to Improve Network Performance

ID: Q224585

The information in this article applies to:

Microsoft Windows NT Server version 4.0
Microsoft Windows NT Workstation version 4.0

SYMPTOMS

Network performance degrades as user sessions increase.

CAUSE

TCP creates and maintains a hash table of transmission control blocks (TCBs) to store data for each TCP connection. A control block is attached to the table for each active connection. The control block is deleted shortly after the connection is closed. One aspect of connection overhead is the time it takes to search the Transmission Control Block (TCB) table. Therefore, an optimum hash function helps improve network performance.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:

http://www.microsoft.com/Windows/ServicePacks/

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. This problem was first corrected in Windows NT 4.0 Service Pack 6.

Additional query words: 4.00

Keywords : kbbug4.00 kbfix4.00
Version : winnt:4.0
Platform : winnt
Issue type : kbbug