Q: Interrupts for transferring datapackets to the hardware

Greetings,

I'm currently using the ipw2200 driver version 1.2.2. on gutsy gibbon 
with qos enabled and an intel pro wireless 2915 abg card.

I would like to ask about the mechanics, the intel pro wireless 2915 
uses for filling it's hardware-transmission-queues. If I understand it 
correctly, the card is sendig out interrupts to annouce the ipw2200 
driver, that it just took information out of the ipw2200's software 
queues (0-3 or -1 for cmd-queue), so that ipw's reclaim function can 
free the software queues slots. I would like to use this interrupts to 
compute some rates for later use in other programms.

What I would like to know more about are the events which trigger these 
interrupts. In especially when does the card refill its queues and 
announce an interrupt? How many slots does the card's queues have and 
when does it start to refill? How many slots does the card try to fill 
up by pulling information out of the ipw's-software-queues (my tests 
normally showed only one and in rare cases 2 packets removed from the 
ipw-software-queues on incomming interrupts). How does the card behave 
if it's hardware-queue is empty and it's corresponding software-queue 
also doesn't have any packets to pull out?

Any information on this would be really helpfull to me.

Regards
Klaus


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