Microsoft KB Archive/171950
Article ID: 171950
Article Last Modified on 6/29/2004
- Microsoft SNA Server 4.0, when used with:
- Microsoft Windows NT 4.0
This article was previously published under Q171950
When SNA Server attempts to process two large print jobs (approximately 700 pages), the SNA 3270 Emulator logs an event 685, indicating that a failure to extend a buffer pool occurred. The affected component is terminated and both print jobs fail.
ID 685 Event Details An attempt was made to extend a buffer pool, but the related pool had reached its maximum size. The affected component is terminating, and an audit of the buffer pools just before termination is attached Pool Free Alloced Max Trusted Hdr 122 157 100000 Trusted Elts 50 112 500000 Non-Trusted Hdrs 1 2993 3000 Non-Trusted Elts 87 3142 10000 Comname Pid Trusted Hdrs Elts SNABASE 00000072 Y 0 0 MNGAGENT 000000A7 Y 8 11 MNGCLI 000000C1 Y 12 36 SNASERVR 00000068 Y 5 5 SNADLC2 00000106 Y 5 5 SNADLC1 000000F3 Y 5 5 WIN3270 000000F0 N 0 0 SNAPRINT 0000005A N 2992 3055 EXPLANATION This error is almost always due to either an SNA component (including possibly an emulator) losing buffers or a slow emulator (or RUI application) using a session without pacing. ACTION Contact your support personnel.
The print server will occasionally produce an extra credit message. Normally this would not cause a problem. The print server would cope with the extra message. However, in the case of a very large job, the print server never has time to catch up with the extra messages. The input queue increases until the buffer limit is reached (3,000 outstanding messages).
Defer sending credit messages until the print server is capable of processing the message immediately, so that the message is not put back on the input queue.
Microsoft has confirmed this to be a problem in SNA Server 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
Keywords: kbbug kbfix kbprint kbnetwork KB171950