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Chapter 3 Configuring ipge and e1000 Driver Parameters 39
You can add the additional delay by setting the ipg0 parameter from 0 to 255, which
is the media byte time delay.
TABLE 3-8 defines the enable_ipg0 and ipg0 parameters.
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 3-9 lists the default values and allowable values for the IPG parameters.
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.
TABLE 3-8 Parameters Defining enable_ipg0 and ipg0
Parameter Values Description
enable_ipg0 0
1
enable_ipg0 reset
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)
TABLE 3-9 Read-Write Interpacket Gap Parameter Values and Descriptions
Parameter Values
(Byte-time)
Description
ipg1 0 to 255 Interpacket gap 1 (Default = 8)
ipg2 0 to 255 Interpacket gap 2 (Default = 4)