how to bind single interface with more than one cpu

[Benjamin]

  Hi,

We have one server which i having 4 CPU core.So in that i want to bind 2 
CPU with one LAN interface for high network performance.

i tried to set smp_afinity , i can change irq of interface on different 
cpus but i can't bind it with 2 cpus.

How to do it?

Regards,
Benjamin