OSI/TS Configuration and Management Manual

Configuring the OSI/TS Subsystem
OSI/TS Configuration and Management Manual—424831-001
3-11
Process Attributes
Process Attributes
The processes in your OSI/TS subsystem include TSP processes, NSP processes
(provided by X25AM or TLAM/PAM), and application processes.
For each TSP process you add to your subsystem, you should consider the following
OSI/TS PROCESS attributes:
•
PRIORITY
•
LANDFT
•
LANDFC
The following subsections discuss each one of these attributes.
PRIORITY Attribute
The PRIORITY attribute specifies the execution priority for the process. If the value is
set too low, the process may cause congestion. If the value is set too high, the process
may prevent other processes from running. Over LANs, a process having a low priority
can lose frames and cause extra system overhead for retransmission. Remember to also
consider any other non-OSI processes that might be running in the same CPU(s).
LANDFC and LANDFT Attributes
The LANDFC attribute specifies the maximum number of Layer 2 frames per I/O
operation. The LANDFT attribute specifies the amount of time allowed for blocking of
Layer 2 frames in the controller before forwarding data to the TLAM/PAM I/O process.
When the LANDFT attribute is set to a high value, the LANDFC attribute tends to
reduce the CPU processing cycles required as the LANDFC value is increased. If the
LANDFC value is set too high, throughput can be reduced. A LANDFC value of 10
frames is usually the point of diminishing return—higher values are not usually helpful
values under 3 are not recommended.
When the LANDFC attribute is set to a high value (10 frames or above), the LANDFT
attribute also tends to reduce the CPU processing cycles required as the LANDFT value
is increased. If the LANDFT value is set too high, throughput can be reduced. A
LANDFT value of 10 tics (.1 seconds) is usually the point of diminishing return—higher
values (a longer time interval) is not usually helpful; values under 3 tics are not
recommended. In general, a larger value can be specified when the load is high,
especially if the message size is small.
Connection-Related Attributes
In addition to the PROCESS attributes, a number of other attributes relate to the
establishment of connections. These include:
•
MULTIPLEX
•
PASSIVEMUX
•
CONNECTTIMEOUT