Sun Microsystems Ethernet MMF/UTP Adapter manual 8Parameters Defining enableipg0 and ipg0

You can add the additional delay by setting the ipg0 parameter from 0 to 255, which is the media byte time delay.

TABLE 3-8defines the enable_ipg0 and ipg0 parameters.

TABLE 3-8Parameters Defining enable_ipg0 and ipg0

Parameter	Values	Description
enable_ipg0	0	enable_ipg0 reset
	1	enable_ipg0 set (Default=8)
ipg0	0 to 255	The additional time delay (or gap) before
		transmitting a packet (after receiving the
		packet) (Default=8)

The ipge device supports the programmable interpacket gap (IPG) parameters ipg1 and ipg2. The total IPG is the sum of ipg1 and ipg2. The total IPG is 0.096 microseconds for the link speed of 1000 Mbit/sec.

TABLE 3-9lists the default values and allowable values for the IPG parameters.

TABLE 3-9Read-Write Interpacket Gap Parameter Values and Descriptions

Parameter	Values	Description
	(Byte-time)
ipg1	0 to 255	Interpacket gap 1 (Default = 8)
ipg2	0 to 255	Interpacket gap 2 (Default = 4)

By default, the driver sets ipg1 to 8-byte time and ipg2 to 4-byte time, which are the standard values. (Byte time is the time it takes to transmit one byte on the link, with a link speed of 1000 Mbit/sec.)

If your network has systems that use longer IPG (the sum of ipg1 and ipg2), and if those systems seem to be slow in accessing the network, increase the values of ipg1 and ipg2 to match the longer IPGs of other machines.

Chapter 3 Configuring ipge and e1000 Driver Parameters 39