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The default size of the data buffer is 4096 bytes. To determine if you need to change the default value, issue the DISPLAY SYSTEMS command and compare the values under the RECV and SPLITS columns. If SPLITS is high relative to RECV, you may want to define a larger buffer to improve performance.
The size of the data buffer does not have to match the transmission buffers size of the communications server. However, because the size of the data buffer has an impact on both virtual storage use and performance, you should try to find an optimal size. If the buffer is too large, virtual storage space is wasted. If the buffer is too small, performance suffers from the additional overhead of splitting and reassembling data.
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