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Io_uring, kTLS and Rust for zero syscall HTTPS server

Around the turn of the century we started to get a bigger need for high capacity web servers. For example there was the C10k problem paper.

In the end the web server just puts stuff on the queue, and calls a library function that only does that syscall if the kernel actually has stopped busylooping. The request load will still not be perfectly balanced between the threads (and therefore cores), but I guess fixing that would have to be the topic of a future post. The code needs a lot of work, and there’s no guarantee that the TLS library (rustls) doesn’t do memory allocations during handshakes.

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