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Configuring Gigabit Ethernet Parameters
Understanding the Gigabit Ethernet Parameters
Chapter 2
14
in all. One of the two parameters specifies the number of data buffers that the card must
transmit (or receive) before interrupting and the other specifies the number of system
clock ticks that must elapse before interrupting.
The four tuning parameters are summarized in the following table.
A send interrupt is generated by the card to the host when either:
• the number of buffers sent by the card since the previous send interrupt equals
send_max_bufs
or
• the time that has elapsed since the previous send interrupt equals send_coal_ticks (a
value of zero disables timer-based interrupt coalescing),
whichever occurs first.
A receive interrupt is generated by the card to the host when either:
• the number of frames received by the card since the previous receive interrupt
equals recv_max_bufs
or
• the time that has elapsed since the previous receive interrupt equals recv_coal_ticks
(a value of zero disables timer-based interrupt coalescing),
whichever occurs first.
Table 2-1 Performance Tuning Parameters
Name Range Default Units
send_max_bufs 1 – 128 16 (for gelan)
10 (for igelan)
# of buffers
recv_max_bufs 1 – 256 1 # of buffers
send_coal_ticks 0 – 10000000 1000 (for gelan)
150 (for igelan)
microseconds
recv_coal_ticks 0 – 10000000 0 microseconds