IntraServer Technology ITIpci 5100G/GF - Manual (Page 31)

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Note: Any changes made with ndd will be lost when you reboot the system.
To make configuration changes survive reboot, store driver settings in the
/etc/rc2.d/S99itialt file (see Saving Driver Parameters Beyond
Reboot).
Link Negotiation
The default configuration for link negotiation of the Gigabit Ethernet link is
auto
. With this setting the ITI-5100G/GF adapter will use IEEE 802.3-
1998 auto negotiation.
If you are connecting the adapter to Gigabit Ethernet equipment that does not
support auto negotiation, or if there is a problem establishing a link between
the two devices, auto negotiation can be turned off (see Available
Parameters).
Increasing TCP/IP Performance
The TCP/IP performance of the ITI-5100G/GF PCI adapter can be increased
by changing the TCP/IP ndd values. This can be done with the ndd (1M)
utility, as described below.
Enter the following ndd commands to increase TCP/IP performance:
# ndd -set /dev/tcp tcp_recv_hiwat 65535
# ndd -set /dev/tcp tcp_xmit_hiwat 65535
# ndd -set /dev/udp udp_recv_hiwat 65535
# ndd -set /dev/udp udp_xmit_hiwat 65535
To avoid losing these settings when reboot occurs, add your ndd parameter
settings to the start-up file as described in the following section, Saving
Driver Parameters Beyond Reboot.