Expand Configuration and Management Manual (H06.21+, J06.10+)

Tuning
Expand Configuration and Management Manual — 529522-013
19 - 7
Application Message Size
For more information on configuring the variable packet-size feature, see Variable
Packet Size Feature on page 17-67.
Application Message Size
Application message size is the number of data bytes sent to an Expand line-handler
process by a higher-level process. The application message size has a major effect on
Expand line-handler process processor overhead and Expand subsystem overhead,
which can affect throughput. By increasing the application message size, you can
greatly increase potential throughput and decrease processor use.
Application Message Size and Data Flow
Figure 19-2 shows the flow of data from an application on one node to an application
on another node through an Expand-over-IP line-handler process. Application A, in its
request to QIO, defines the application message size.
Note. If you use the Expand subsystem SCF ALTER LINE command to set the L2TIMEOUT
modifier, you must convert the result of this formula to a time interval. For example, if the result
is 300 (3 seconds), you will enter this command:
ALTER LINE $device_name, L2TIMEOUT 3.00
Figure 19-2. Application Data Flow for Expand-Over-IP
Via
Message
System
Application
A
Expand
TCP/IP
Process
System \A
Application
B
Expand
TCP/IP
Process
System \B
IP Network
VST073.vsd
Via
Message
System
Via QIO Via QIO