There are three new SYBTPSEC parameters to control data transfer flow: SO_RCVBUF, SO_SNDBUF, and TCP_NODELAY.
SO_RCVBUF overrides the TCP/IP system default for the maximum size of the receive buffer. A value of -1 (the default) indicates that the system default should be used.
SO_SNDBUF overrides the TCP/IP system default for the maximum size of the send buffer. A value of -1 (the default) indicates that the system default should be used.
TCP_NODELAY overrides the TCP/IP system default for the Nagel Algorithm. A value of 1 disables the feature, and a value of 0 enables it. A value of -1 indicates that the system default should be used.
The SO_RCVBUF and SO_SNDBUF options control the physical packet size for the TCP/IP transmissions. Optimum packet sizes depend on the amount of data received or transmitted by an individual transaction. TCP/IP data transmission can also be controlled by the Nagel Algorithm option, which attempts to reduce the amount of data collisions by adding an arbitrary wait between receives and sends.
SO_RCVBUF, SO_SNDBUF, and TCP_NODELAY settings override the z/OS system defaults for any connections accepted through a particular listener.
