Sun Microsystems Sun Quad Post-Installation Procedures Optional, Configuring Driver Parameters

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 17.)

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, “Configuring the Quad FastEthernet Device Driver Parameters,” 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.

Chapter 3 Configuring the Driver Software 15