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Q172484: 5250 Printing Causes High CPU Utilization

Article: Q172484
Product(s): Microsoft SNA Server
Version(s): WINDOWS:3.0,3.0 SP1
Operating System(s): 
Keyword(s): kbnetwork
Last Modified: 02-APR-2000

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft SNA Server, versions 3.0, 3.0 SP1 
-------------------------------------------------------------------------------


SYMPTOMS
========

An SNA Server system using the print server service for 5250 printing may
occasionally show very high CPU utilization, even though there are no print jobs
currently printing. In addition, the AS/400 that SNA Server is connected to may
also show an increase in its CPU utilization at the same time.

You may notice that there are print jobs on the AS/400 print writers waiting to
be printed when this problem occurs.

An SNA Server Data Link Control (DLC) message traces shows repeated LUSTAT
messages being sent between the SNA Server computer and the AS/400 in rapid
succession while the problem is going on.

CAUSE
=====

When a print request is received from a host, the print server issues a
StartDoc() call to initialize the connection to the printer that the print
session is configured to use. The CPU utilization problem occurs when the
StartDoc() call returns an error that the 5250 print provider does not correctly
handle. The print server fails to send an error message to the AS/400 when the
StartDoc() call fails and does not respond to the AS/400 print request at all.
The result is that the print server and the AS/400 establish a loop by sending
LUSTAT messages back and forth. The frequency of these messages causes the CPU
utilization on both systems to increase.

If the StartDoc() call is successful, the AS/400 print job is printed normally.

STATUS
======

Microsoft has confirmed this to be a problem in SNA Server versions 3.0 and 3.0
Service Pack 1 (SP1). This problem was corrected in the latest SNA Server
version 3.0 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
================

The following is an excerpt from a Nodemsg1.atf trace captured while the problem
was occurring:

  DLC   ------------------------------------------------------------------
  --------------
  DLC   01020101->04160000 DLC DATA
  DLC                      DAF:0E OAF:01 ODAI:off Normal
  DLC                      LUSTAT RQE DFC FI BC EC DR1 PI CD
  DLC
  DLC   ---- Header  at address 01444758, 1 elements ----
  DLC   07050000 00002C00 0E01A904 0100CC00     <......,...z.....>
  DLC
  DLC   ---- Element at address 0193BB68, start 10, end 17 ----
  DLC   4B912004 00060000                       <Kj .....        >
  DLC   ------------------------------------------------------------------
  --------------
  DLC   01020101->04160000 DLC DATA
  DLC                      DAF:21 OAF:01 ODAI:off Normal
  DLC                      LUSTAT RQE DFC FI BC EC DR1 CD
  DLC
  DLC   ---- Header  at address 0144444C, 1 elements ----
  DLC   07050000 00002C00 2101DA7A 0100CC00     <......,.!..z....>
  DLC
  DLC   ---- Element at address 0193F470, start 10, end 17 ----
  DLC   4B902004 00060000                       <K. .....        >
  DLC   ------------------------------------------------------------------
  --------------
  DLC   04160000->01020101 DLC DATA
  DLC                      DAF:01 OAF:0E ODAI:off Normal
  DLC                      +RSP FMD BC EC PI
  DLC
  DLC   ---- Header  at address 0144478C, 1 elements ----
  DLC   07050000 00002C00 010E0000 01008700     <......,.......g.>
  DLC
  DLC   ---- Element at address 0193BB68, start 10, end 12 ----
  DLC   830100                                  <c..             >
  DLC   ------------------------------------------------------------------
  --------------
  DLC   04160000->01020101 DLC DATA
  DLC                      DAF:01 OAF:0E ODAI:off Normal
  DLC                      LUSTAT RQE DFC FI BC EC DR1 CD
  DLC
  DLC   ---- Header  at address 0144437C, 1 elements ----
  DLC   26050002 00002C00 010EA905 01008700     <&.....,...z...g.>
  DLC
  DLC   ---- Element at address 0193EA2C, start 10, end 17 ----
  DLC   4B902004 00060000                       <K. .....        >
  DLC   ------------------------------------------------------------------
--------------
  DLC   04160000->01020101 DLC DATA
  DLC                      DAF:01 OAF:21 ODAI:off Normal
  DLC                      LUSTAT RQE DFC FI BC EC DR1 PI CD
  DLC
  DLC   ---- Header  at address 0144444C, 1 elements ----
  DLC   04050004 00002C00 0121DA7B 01008700     <......,..!.{..g.>
  DLC
  DLC   ---- Element at address 0193F470, start 10, end 17 ----
  DLC   4B912004 00060000                       <Kj .....        >
  DLC   ------------------------------------------------------------------
  --------------

With the fix applied, the 5250 print provider correctly handles errors returned
by the StartDoc() call.

Additional query words: spike perfmon pegged

======================================================================
Keywords          : kbnetwork 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ300SP1
Version           : WINDOWS:3.0,3.0 SP1
Issue type        : kbbug
Solution Type     : kbfix

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

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