How to benchmark packet throughput for submitting patches?

[Zvi Effron <zeffron@xxxxxxxxxxxxx>]

I see that many XDP patchset submissions to the bpf mailing list
include benchmark numbers for packet throughput to show how much the
change improves (or worsens) performance. They frequently show numbers
for a single core test.

I was wondering what methodology people are using to generate these
benchmark results?

Thanks!
--Zvi