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The performance of VTAM communication can be significantly affected by the size of the transmission buffers. As you set up the communications server, you must decide what buffer size is best by considering the following:
The data size is determined by the client and not by CA-L-Serv. If incoming data is too large to fit in a single transmission buffer, CA-L-Serv breaks it up and stores it in several buffers. CA-L-Serv recombines the data before delivering it to the receiving client.
For example, if a client is transmitting 7K of data and the transmission buffers are 4K each, CA-L-Serv breaks up and recombines data as shown here:
Since there is overhead involved in breaking up and recombining data, try to minimize the number of times CA-L-Serv does this by establishing the appropriate buffer size.
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