Avoiding the logic of tcp stack processing does indeed come into play. My colleague process data sent through a tcp connection in a LAN. So he basically ignores

Avoiding the logic of tcp stack processing does indeed come into play. My colleague process data sent through a tcp connection in a LAN. So he basically ignores all the tcp header of the incomming data. He simply checks the source ip. He will test mTCP to get a full fledged tcp/ip stack so he will be able to measure it's overhead.