Post-installation procedures (optional), Configuring driver parameters, Increasing tcp/ip performance – Sun Microsystems 805-1797-10 User Manual

Page 28

Post-Installation Procedures (Optional)

Perform the tasks in the following sections to customize the performance of the Sun
Quad FastEthernet PCI adapter.

Configuring Driver Parameters

The

qfe

device driver, which is loaded from the CD-ROM, controls the

SUNW,qfe

Ethernet devices. The device driver automatically selects the link speed using the
auto-negotiation protocol with the link partner. (See “Auto-Negotiation” on page 16.)

You can manually configure the

qfe

device driver parameters to customize each

SUNW,qfe

device in your system in one of three ways:

Configure the

qfe

driver parameters generally for all

SUNW,qfe

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

qfe.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.

See Appendix C,” for more information.

Increasing TCP/IP Performance

The TCP/IP performance of the Sun Quad FastEthernet PCI 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:

# 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 take effect immediately and affect all the networking interfaces in
the system. The changes are lost when you reboot the system.

Sun Quad FastEthernet PCI Adapter Installation and User’s Guide

♦

Revision A, August 1997