DOCUMENT:Q163213 [crossnet] TITLE :WebSTONE Benchmark of IIS May Show Poor Results for MP Systems PRODUCT :Microsoft Windows NT/Microsoft Internet Information Server PROD/VER:4.00 OPER/SYS:WINDOWS KEYWORDS:kbnetwork kbbug4.00 kbfile ------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server version 4.0 ------------------------------------------------------------------------- SYMPTOMS ======== Internet Information Server (IIS) performance drops dramatically on multiprocessor systems when you test with WebSTONE, a popular web benchmark, which uses a non-abortive (graceful) close method for TCP sessions. SPECWEB is another benchmark tool that has shown similar results. NOTE: This problem does not occur when using regular real-world browsers such as Internet Explorer or Netscape Navigator. CAUSE ===== There was a high rate of contention for a TCP resource, which lead to poor performance. RESOLUTION ========== Microsoft has updated Tcpip.sys to correct the problem. Instructions for installing it are available from Microsoft support channels, or directly from the following Internet location: ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/ hotfixes-postSP2/TCPIP-fix STATUS ====== Microsoft has confirmed this to be a problem in Windows NT version 3.51 and 4.0. A supported fix is now available, but is not fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information. KBCategory: kbnetwork kbbug4.00 kbfile KBSubcategory: nttcp NTSrvWkst Additional reference words: 4.00 prodnt ============================================================================ THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1996.