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I was going to mention kernel TLS hopefully enabling sendfile for mostly-HTTPS workloads, as that’s the direction everything is heading anyway, and without it we don’t get zero-copy for those connections.

Now I’m more curious about the actual threshold where not having sendfile begins causing noticeable performance problems… at what point before you become Netflix?

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If your cache can face-tank a HTTP-DDoS, you don't need fragile fingerprinting techniques to distinguish bad from good, thus reducing the user impact (less accidentally-blocked users). The less cost you have for filling that 100 Gbit NIC with your TLS cache traffic, the more boxes you can afford. Internet exchanges are surprisingly cheap to connect to.

Of course sharing resources between a couple services would be good, as NICs and switch ports are sill a way from free.

What about http2?

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