[joaovictortr]

There is a presentation from EuroBSDCon 2019, that describes the techniques and hardware used to achieve that figure [0].

There is also a thread in HN if you're interested [1].

[0] https://people.freebsd.org/~gallatin/talks/euro2019.pdf

[1] https://news.ycombinator.com/item?id=21043765