Sun Microsystems Gigabit Ethernet MMF/UTP Adapter manual Interrupt Parameters, Jumbo Frames

Interrupt Parameters

TABLE 3-10describes the receive interrupt blanking values.

TABLE 3-10RX Blanking Register for Alias Read

Field Name	Values	Description
rx_intr_pkts	0 to 511	Interrupt after this number of packets has arrived since
		the last packet was serviced. A value of zero indicates no
		packet blanking. (Default=3)
rx_intr_time	0 to 524287	Interrupt after 4.5 US ticks have elapsed since the last
		packet was serviced. A value of zero indicates no time
		blanking. (Default=1250)

Jumbo Frames

The variable accept-jumboenables the driver to instruct the upper layers that the driver is operating in Jumbo Frames mode.

TABLE 3-11accept-jumbo Parameters

Parameter	Values	Description
accept-jumbo	1	Enables Jumbo Frames mode and sets MTU
		to greater than 1500.
	0	Jumbo Frames is not enabled. MTU is at
		1500.

To get the maximum MTU setting use the following command:

#ifconfig ipge mtu 8192

Although Jumbo Frames is configurable in 10/100 mode, Jumbo Frames is only supported in the Gigabit (1000 Mbit/sec) mode. Configuring Jumbo Frames enables the Ethernet interfaces to send and receive packets of up to 8192 bytes. However, the actual transfer size depends on the switch capability.

Refer to the documentation that came with your switch for exact commands to configure Jumbo Frames support.

40 Sun PCI-Express Dual Gigabit Ethernet MMF/UTP Adapter Installation and User’s Guide • June 2006