[Soekris] Wimax and SBC's

[Arnt Gulbrandsen]

Bao C. Ha writes:
> I am surprised that a Soekris 48xx with its 266Mhz Cyrix processor is 
> having problems pushing 4-5Mbps. My suspicion is that you might be up 
> against the ISA limit, if you use the 802.11b pcmcia cards.

Interrupts are another source of problems. Interrupts are fine for 
low-frequency work, where most of the CPU's time is spent doing other 
work that should be interrupted for handling packets.

But if you have one interrupt per packet and want to forward about a 
million of those per second, then the overhead to switch into interrupt 
context becomes a big problem. For a router, it's better to use a 
chipset/driver combination which can receive/transmit many packets per 
interrupt.

Arnt