Btw Windows built an api based on io_uring https://windows-internals.com/i-o-rings-when-one-i-o-operati...

Nice! Haven't heard about this before, must be something really new?

Anyways given extremely high syscall cost due to Meltdown workarounds, batching multiple operations makes more and more sense.

well as far as I know I've read something about it either on lwn or hn and it's really really new. I'm not exactly sure if it is even possible to use.

> Again, pointless in the big picture. Most of the time these details are hidden by libraries.

Except for when they're not, or those libraries don't expose the "one little implementation detail", and a platform hack sneaks in, and _thats_ how we end up with "well it works fine on windows and we use asio so shrug". Unfortunately games are really bad for doing this in my experience (and I'm guilty of doing it on occasion too).