I find the introduction of a hybrid polling/interrupt driven network interface really interesting. Mainly because we did the same work in 2003 on NetBSD for a wireless router that never made it to market. We were at the opposite end of the spectrum. Basically, we were running on a 100 MHz 486 and spent too much time on interrupts with all the network traffic. It's funny that it is the same situation for them on the latest systems out there (of course for some of the same, but some different reasons as well).