It's time to replace TCP in the datacenter (2023)

And QUIC. And that thing tesla presented recently, with custom silicon even.

And as usual, hardware gets faster, better and cheaper over the next years and suddenly the problem isn't a problem anymore - if it even ever was for the vast majority of applications. We only recently got a new fleet of compute nodes with 100gbit NICs. The previous one only had 10, plus omnipath. We're going ethernet only this time.

I remember when saturating 10gbit/s was a challenge. This time around, reaching line speed with tcp, the server didn't even break a sweat. No jumbo frames, no fiddling with tunables. And that actually was while testing with 4 years old xeon boxes, not even the final hw.

Again, I can see how there are use cases that benefit from even lower latency, but thats a niche compared to all DC business, and I'd assume you might just want rdma in that case, instead of optimizing on top of ethernet or IP.

This is a solid answer, as someone on the ground. TCP is not the bogeyman people point it out to be. It's the poison apple where some folks are looking for low hanging fruit.