Ethernet Support Guide (for HP-UX 11i v1, 11i v2)

Administration
Gigabit-Specific Information
Chapter 3
45
parameters. 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 amount of
time 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 0 disables timer-based interrupt coalescing), and at
least one frame has been sent by the controller, 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 0 disables timer-based interrupt coalescing), and at
least one frame has been received by the controller, whichever occurs first.
For more information, see:
http://docs.hp.com/hpux/netcom/index.html
This site provides detailed information on this topic.
Name Range Values 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