Performance very simple example versus full blown router

[Robert Morris]

Brecht,

One way in which your simple configuration is different from our IP
configuration is that you have a ToDevice(eth3) but no
PollDevice(eth3). The presence of a PollDevice(eth3) lets
ToDevice(eth3) avoid some interrupts and programmed I/O instructions.
Can you re-run your tests with the addition of something like

  PollDevice(eth3) -> Discard;

and let us know the results?

Thanks,
Robert