[atombender]

Round-robin routing is one way that really doesn't cut it at the level of scale that Github and others operate at. Overlay networks also typically have no notion of load and how to send traffic to the hop with the least amount of load.

[user5994461]

Use least connections for HTTP load balancing, it is load aware.

[atombender]

That's an HAProxy option. What do you do to load-balance HAProxy itself? That's what the article about.