Memory Leak in TN3270 Server if RU Sizes Exceed TN3270 Defaults (139212)
The information in this article applies to:
- Microsoft SNA Server 2.11, when used with:
- the operating system: Microsoft Windows NT
This article was previously published under Q139212 SYMPTOMS
When the TN3270 server runs for many days or weeks, server performance
becomes sluggish and Windows NT eventually runs out of virtual memory.
Also, Windows NT performance monitor shows paged pool bytes to be steadily
increasing for the TN3SERVR process.
CAUSE
The TN3270 server initially allocates inbound and outbound buffers when
a TN3270 client connects to the server, using the inbound and outbound
"Default RU sizes" configured in the TN3270 Admin Options dialog.
However, if the TN3270 client's BIND request negotiates to larger RU
sizes than these defaults, the TN3270 server allocates new inbound and
outbound buffers though never frees the previously acquired buffers.
RESOLUTION
To workaround this problem, increase the Inbound and/or Outbound default
RU sizes within the TN3270 Server Admin Options dialog to accommodate the
largest RU sizes that will be requested by the TN3270 client users.
To correct this problem, install the update to the SNA Server 2.11 TN3270
service mentioned below. Microsoft has updated the file
<ntroot>\TN3SERVR.EXE to correct this problem.
STATUS
Microsoft has confirmed this to be a problem in SNA Server for Windows NT.
This problem was corrected in the latest SNA Server for Windows NT, 2.11
U.S. Service Pack. For information on obtaining the Service Pack, query on
the following word in the Microsoft Knowledge Base (without the spaces):
| Modification Type: | Major | Last Reviewed: | 10/22/2003 |
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| Keywords: | kbbug kbfix kbnetwork KB139212 |
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