Increasing TCP/IP Performance

The TCP/IP performance of the Sun Quad FastEthernet SBus adapter can be increased by changing the TCP high water mark to 64K. This can be done with the ndd utility as follows.

1. As superuser (root), type:

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   # ndd -set /dev/tcp tcp_xmit_hiwat 65535
   # ndd -set /dev/tcp tcp_recv_hiwat 65535
   # ndd -set /dev/tcp tcp_cwnd_max 65535
   

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   The changes take effect immediately and affect all the networking interfaces in the system.