Sun Microsystems 806-2989-10 manual Interrupt Parameters, Random Early Drop Parameters

Interrupt Parameters

TABLE 4-7describes the receive interrupt blanking values.

TABLE 4-7RX Blanking Register for Alias Read

Field Name	Values	Description
rx_intr_pkts	0 to 511	Interrupt after this number of packets have 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)

Random Early Drop Parameters

TABLE 4-8describes the RX random early detection 8-bit vectors, which allows you to enable random early drop (RED) thresholds. When received packets reach the RED range packets are dropped according to the preset probability. The probability should increase when the fifo level increases. Control packets are never dropped and are not counted in the statistics.

TABLE 4-8RX Random Early Detecting 8-Bit Vectors

Field Name	Values	Description
red_dv4to6k	0 to 255	Random early detection and packet drop vectors for
		when fifo threshold is greater than 4096 bytes and less
		than 6,144 bytes. Probability of drop can be
		programmed on a 12.5 percent granularity. For
		example, if bit 0 is set the first packet out of every eight
		will be dropped in this region. (Default=0)

Chapter 4 Configuring Driver Parameters 31