Microsoft KB Archive/248279

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Poor Performance Observed on Windows NT Load Balancing Service Hosts

PSS ID Number: 248279

Article Last Modified on 10/16/2002

The information in this article applies to:

  • Microsoft Windows NT Server 4.0
  • Microsoft Windows NT Load Balancing Service 1.0

This article was previously published under Q248279


On a cluster host with a single network adapter, the transmission of Internet Protocol (IP) packets for outbound connections (for example, to a back end database) may appear to be paced at 16-millisecond intervals. This may affect the performance of a Windows NT Load Balancing Service (WLBS) cluster, and the problem may be especially noticeable under low loads.

If you disable WLBS the time delay is not improved. If you uninstall WLBS, the problem is resolved.


This behavior occurs because of an interaction failure between WLBS and Network Driver Interface Specification (NDIS).


A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows NT 4.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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

   Date      Time      Size     File name     Platform
   10/12/1999  08:44p   36,112  Wlbs.exe      x86
   10/29/1999  02:06p   60,208  Wlbs.sys
   10/12/1999  08:43p  121,744  Ndis.sys

   10/12/1999  08:43p   51,472  Wlbs.exe      Alpha
   10/29/1999  02:05p  101,104  Wlbs.sys
   10/12/1999  08:41p  213,680  Ndis.sys



Microsoft has confirmed that this is a problem in Windows NT 4.0.

Additional query words: nic card

Keywords: kbbug kbnetwork kbQFE KB248279
Technology: kbWinNT400search kbWinNTLBS100 kbWinNTLBSSearch kbWinNTS400 kbWinNTS400search kbWinNTsearch kbWinNTSsearch