DOCUMENT:Q182331 02-APR-2000 [sna] TITLE :Default 802.2 DLC Pacing Values May Result In Slow Performance PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:4.0 OPER/SYS: KEYWORDS:kbbuglist ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, version 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== SNA Server applications that connect through 802.2 DLC connections configured on a SNA Server 4.0 computer may experience slower performance compared to the same application communicating through 802.2 DLC connections on previous versions of SNA Server. CAUSE ===== SNA Server versions prior to SNA Server 4.0 use a default value of 2 for the Receive Ack Threshold pacing parameter on 802.2 DLC connections. This default was changed to 6 in SNA Server 4.0 after performance testing showed that this yielded better throughput. Additional testing found that in some circumstances using a Receive Ack Threshold of 6 may result in slower throughput when compared to using the previous default value of 2. WORKAROUND ========== Change the Receive Ack Threshold value to 2 from its default value of 6. STATUS ====== Microsoft has confirmed this to be a problem in SNA Server 4.0. This problem was corrected in the latest SNA Server version 4.0 U.S. Service Pack. For information on obtaining this Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K MORE INFORMATION ================ With this update applied, the default Receive Ack Threshold value for 802.2 DLC connections is 2. Additional query words: ====================================================================== Keywords : kbbuglist Technology : kbAudDeveloper kbSNAServSearch kbSNAServ400 Version : WINDOWS:4.0 Issue type : kbbug Solution Type : kbfix ============================================================================= 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 2000.