AIX :

For better performance on SMP systems, try the following:

ifconfig <iface> thread

This allows the interrupt handler for a GigE interface on an SMP AIX box to be multi-threaded.

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IRIX:

edit the file: /var/sysgen/master.d/bsd, and set:

    tcp_sendspace
    tcp_recvspace

The maximum buffer size under Irix 6.5 is 1MB, and is not changeable.