HP-UX SNAplus2 R7 Administration Guide

Configuring APPC Communication
Defining Modes and Classes of Service
Initial window size
The initial setting for the number of request units (RUs) that the local LU can receive before it must
send a pacing response to the remote LU. This can be safely set to
4.
Setting it higher can improve performance in some circumstances, but doing so also increases memory
usage.
Maximum window size
The maximum number of request units (RUs) that the local LU can receive before it must send a pacing
response to the remote LU.
This value is optional. If it is not supplied, the maximum receive pacing window is unlimited. If a
value is supplied, it is used to limit the size of the receive pacing window for adaptive pacing. If
adaptive pacing is not used, this value is ignored.
The pacing window can be from 0 through 32767 bytes. A value of 0 specifies an unlimited window.
If the adjacent node supports only fixed pacing, these values determine the fixed-pacing window size; but
the adjacent node can still set a window size through negotiation. If the adjacent node uses adaptive pacing,
these values set the initial window size.
Specify timeout
Select this option if you want to specify the number of seconds (0 - 65535) that an LU 6.2 session using
this mode must be inactive before it can time out. Changing this value affects only sessions that are activated
using this definition (not sessions that are already active).
If you use a value of 0, sessions are timed out as soon as they become free.
Restrict maximum RU size
Select this option if you want to specify the maximum RU size, which determines how much data is buffered
before being sent to the partner LU.
The upper limit can be from 256 through 62440 bytes. You can safely set the upper limit to 1024 bytes.
Setting it higher can improve performance in some circumstances, but doing so also increases memory usage.
The lower limit can be 0 or a value from 256 through the upper limit you specify.
If the value in this field is different from the RU size defined for the remote node, the size used for a session
with that node can be negotiated to establish an appropriate RU size for the session. The actual value cannot
be lower than the lower limit field.
These numbers, together with the send and receive pacing values, can be used to tune the session-level
throughput between the local and partner LUs. If you do not know what values to use, start with the default
values and adjust them as needed to maximize throughput.
Reset to SNA defined values
If you are modifying a standard mode using the Motif dialog, you can click on this button to reset the values
of the mode parameters to the SNA-defined values.
7.5.2 Additional Configuration
After performing the mode configuration, continue with the following configuration tasks:
• To define CPI-C side information, see Section 7.6, Defining CPI-C Side Information.
• To define APPC security, see Section 7.7, Configuring APPC Security.
• To configure 5250 communication, see Chapter 8, Configuring User Applications.
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