> > I don't have the specs any more, but I think you can actually get
> > memory cycles to 500ns [1] (IO cycles are slower) giving 4MB/s for
> > 16bit transfers.  So 10M ethernet is 'only' about 1/3 of the
> > bandwidth.
> > But not that your entire system is busy for this fraction of the
> > time regardless of the cpu speed.
> 
> My laptop doesn't go into 100% usage when I use the ne0 pcmcia network
> adapter (which I think is simplex)...what do you mean exactly?

It is busy for the time taken to receive/send an ethernet packet.
This is because the data transfer is done by the cpu, at a rate
determined by the time taken to do a pcmcia data transfer.

The problems arise because it is the instantaneous usage that matters.

	David

-- 
David Laight: david@l8s.co.uk