Appendix B
Configuring the Sun Quad FastEthernet Device Driver Parameters
39
Setting the
qfe
Device Driver
Parameters
This section describes how to set the
qfe
device driver parameters in three ways:
■
Using the
ndd
utility
■
Using the
qfe.conf
file
To set device driver parameters dynamically while the system is running, use the
ndd
utility. For example, on a hot swap system, you can use the
ndd
utility to
display and set parameters for
qfe
devices without rebooting the system. However,
if you reboot the system, or if the system shuts down, the parameters will revert
back to their default settings. Using the
ndd
utility is a good way to display the
current configuration and to test different parameter settings.
To set parameters for a single
qfe
device (or a subset of
qfe
devices) in the system
permanently, set the parameters in the
/kernel/drv/qfe.conf
file. While the
parameters values set in the
qfe.conf
file will persist after rebooting the system,
you do not need to reboot the system in order for the parameter changes to take
effect. You can use your system’s hot swap commands to apply the
qfe.conf
changes to the
qfe
devices.
Using the
ndd
Utility to Set and Display
Parameters
The following sections describe how you can use the
ndd
utility to modify (with the
-set
option) or display (without the
-set
option) the parameters for each
SUNW,qfe
device.
Identifying Device Instances
Before you use the
ndd
utility to display or to set a parameter for a
qfe
device, you
must specify the device instance number for the utility, because there will be at least
four
SUNW,qfe
devices. You can find the instance numbers of the
qfe
devices in the
/etc/path_to_inst
file.
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