Configuring Driver Parameters; Increasing Tcp/Ip Performance - Sun Microsystems SunFastEthernet Adapter 2.0 Installation And User Manual

3.6.2 Configuring Driver Parameters
The hme device driver, which is loaded from the CD-ROM, controls the
SUNW,hme Ethernet device. The device driver automatically selects the link
speed using the auto-negotiation protocol with the link partner. (See
Section 3.6.5, "Auto-Negotiation.")
You can manually configure the hme device driver parameters to customize
each SUNW,hme device in your system in one of three ways:
•
Configure the hme driver parameters generally for all SUNW,hme devices in
the system by entering the parameter variables in the /etc/system file.
•
Set a parameter on a per-device basis by creating the hme.conf file in the
/kernel/drv directory.
•
Use the ndd utility to temporarily change a parameter. This change is lost
when you reboot the system.
Refer to the Platform Notes: The hme Fast Ethernet Device Driver document
(Part No: 802-5333) for more information.

3.6.3 Increasing TCP/IP Performance

The TCP/IP performance of the SunFastEthernet 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 type:
# ndd -set /dev/tcp tcp_xmit_hiwat 65535
# ndd -set /dev/tcp tcp_recv_hiwat 65535
# ndd -set /dev/tcp tcp_cwnd_max 65534
The changes will take effect immediately. These changes affect all the
networking interfaces in the system.
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