[jandrewrogers]

No idea, don’t really care. That these performance disparities exist isn’t controversial, several well-known companies have written about it e.g. nginx[0]. I deploy on Kubernetes, but all of our I/O intensive infrastructure is deployed on virtual machines for performance reasons — we still lose ~10% on a virtual machine compared to bare metal but a container on bare metal is significantly worse.

All high-performance data infrastructure bypasses the operating system for most things, taking total control of the physical hardware it uses. Cores, memory, storage, network. Linux happily grants that control, with caveats. It doesn’t work the same inside Kubernetes and Docker, and no one can figure out how to turn it off. Maybe you don’t work on I/O intensive applications, but for people that do this is a well-documented phenomenon. My teams have wasted far too many hours trying to coax good performance out of code in containers that works just fine on bare metal and virtual machines.

[0] https://www.nginx.com/blog/comparing-nginx-performance-bare-...