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Q136032: Systems Management Server Sender Packet Size Computation

Article: Q136032
Product(s): Microsoft Systems Management Server
Version(s): winnt:1.0,1.1
Operating System(s): 
Keyword(s): kbnetwork smssenders kbSMSSender
Last Modified: 31-JUL-2001

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The information in this article applies to:

- Microsoft Systems Management Server versions 1.0, 1.1 
-------------------------------------------------------------------------------


SYMPTOMS
========

The Sender is designed to dynamically compute a packet size based on link speed
when sending packages. It begins with a 1024 byte packet and records the time to
transmit. Based on this time, the sender increases or decreases the packet size
as necessary within the range of 1024 to 262144 bytes.

However, there is a range of speeds where the Sender does not adjust packet size
correctly, forcing the maximum packet size on a link that is too slow.

CAUSE
=====

The Sender incorrectly computes the packet size.


NOTE: In many WAN environments 56k bit to 256k bit links are common. Some WANs
have links below 38k bits per second, such as when using modems for a RAS Sender
address.

The following table lists link speed and the corresponding packet size:

  Link Speed   Byte Buffer
  (bits/sec)   Packet Size
  ----------   -----------
  262144       262144
  6552         245700
  6112         229200
  5672         212700
  5232         196200
  4792         179700
  4352         163200
  3912         146700
  3472         130200
  3032         113700
  2592         97200
  2152         80700
  1712         64200
  1272         47700
  832          31200
  424          15900
  216          8100
  104          3900
  48           1800


STATUS
======

Microsoft has confirmed this to be a problem in Systems Management Server
versions 1.0 and 1.1. This problem has been corrected in Systems Management
Server version 1.2.

Additional query words: prodsms sms

======================================================================
Keywords          : kbnetwork smssenders kbSMSSender 
Technology        : kbSMSSearch kbSMS100 kbSMS110
Version           : winnt:1.0,1.1

=============================================================================

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