
Configuring DLSw Services
5-6 114063 Rev. A
Parameter: TCP Window Size
Default: 8000 (octets)
Range: 5000 to 64000 (octets)
Function: Specifies (in octets) the maximum amount of DLSw data that the local
and remote TCP entities can send before requiring an acknowledgment,
or can receive before acknowledging. The TCP Window Size parameter
informs DLSw about how much data can be outstanding on a TCP
connection. The size of the window affects performance, latency, flow
control, and memory usage. A larger window causes less flow control to
occur with a possible increase in latency. Editing the TCP Window Size
parameter affects new TCP session establishment only. Existing sessions
are unaffected.
Instructions: Type in any valid number of octets. Generally, networks with slower line
speeds require smaller window sizes, while networks with faster line
speeds benefit from larger windows. The default value is acceptable for
most networks. A TCP Window Size setting of 5000 octets may be
appropriate for small networks. For high-speed networks, you should
increase this value.
If the TCP Window Size value for DLSw services is less than the global
TCP Max Window value, DLSw uses its own TCP Window Size.
If the TCP Window Size for DLSw services is greater than the global
TCP Max Window size, Site Manager prompts you to increase the global
TCP Max Window size to the TCP Window Size set for DLSw services.
MIB Object ID: 1.3.6.1.4.1.18.3.5.1.5.1.4
Note: The default value is based on both NetBIOS and SNA traffic. SNA and
NetBIOS can have frame sizes up to 4 KB, but the default virtual ring MTU
limits the frame size on the network to 1500 bytes (unless changed). Keep the
window as small as possible. This allows the most consistent response time
when packets are not excessively queued in TCP. Selection of this parameter
depends on the WAN speed and frame size distribution.
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