Use fastest docker images for benchmarking

[nisbet-hubbard]

Since I mentioned nginx’s kTLS support recently in another thread, I hope this thread will help us collect candidates for future benchmarking.

At present, I believe it still makes sense to benchmark the out-of-box performance of each reverse proxy, since that’s what most users get without further configuration. So, without going so far as to compare the best-tuned example of each proxy, what we can do is identify the fastest docker image that’s available. For nginx, this would seem to be https://github.com/macbre/docker-nginx-http3, which has built-in kTLS support (and needs to be tested on a machine with kernel TLS enabled).

This may change once [experimental.cache] is stabilised, when it’d be a good idea to turn on caching in other docker images as well so we’re comparing like with like.

[junkurihara]

This should be discussed in "Discussion".

[nisbet-hubbard]

docker-nginx-http3 should also better reflect real-world performance of nginx, since Fedora/RHEL’s package e.g. has kTLS on by default.