Testing the performance of ring0 for packet decoding and manipulation.

Just run: `make benchmark`, that's it!

XDP (ring0):

![XDP](benchmark-xdp.png)
![XDP with bursts](benchmark-xdp-with-burst.png)

Classic (ring3):

![Userspace](benchmark-user.png)
![Userspace with bursts](benchmark-user-with-burst.png)