Nice, reading through the epoll implementation shouldn't it re-register to make sure the send() call won't block? Looks like it only non-blocks on the accept socket and then a single read register

Could elaborate on “re-register”? It does not do short writes, if that’s what you mean.

Normally I'd expect an epoll implementation to epoll_ctl to make sure the socket can be written to without blocking. In this benchmark it probably makes no difference but I would think it would make the results a little more inline with a real applications usage of epoll.

This a bare minimal echo server for educational purposes. It is not inline with a real world event loop.

Yeah I understand that, but if you are going for identical performance characteristics of how epoll would normally be used then I would expect it to re-register. Thats all I was getting at.