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If you're going for C10M you can already forget about docker. For performance you really must be as close to the hardware as possible, which possibly means tweaking kernel.

Best example I know of squeezing as much as possible out of the bare metal servers would be StackOverflow, which runs of something in the ballpark of 20 servers(excluding replicas) IIRC.

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You do know that processes in a Docker container are regular processes right? They just have a different namespace. They are as "close to the hardware" as all of your other processes. I'm not sure how you'd go about using your own TCP stack, but if you can do it with a normal process you can do it inside a Docker container.

When working with Docker, it is possible to get down to the metal as you mentioned.

Usually by bypassing the docker networking and using Host only network, but then you lose a lot of the benefits of containers in the first place.

For example, weave or calico networking layer on top— which add a fair bit of latency if your aiming for 10M connections— makes scaling containers quite easy

I would imagine that if you plan on using Docker in your infrastructure seriously, you are aiming for a multi host setup with many containers spread throughout— and can settle for 100k connections per container easily.

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