> I think one thing that weakly surprised me about the article was that cloud flare seem to be mostly using standard BSD sockets apis and, presumably, the kerne

> I think one thing that weakly surprised me about the article was that cloud flare seem to be mostly using standard BSD sockets apis and, presumably, the kernel interface to the network cards. I would have expected their main products (ie being a CDN) to use more specialised network cards and userspace networking (eg the final function they give for UDP does a ton of syscalls, and for tcp it still does several) with a non-BSD api. You might be interested in another article from them: "Why we use the Linux kernel's TCP stack" [1] [1] https://blog.cloudflare.com/why-we-use-the-linux-kernels-tcp-stack/ https://blog.cloudflare.com/why-we-use-the-linux-kernels-tcp...