How does that work? Is that an open source solution like the ZCRX stuff with io uring or does it require proprietary hardware setups? I'm hopeful that the open source solutions today are competitive.

I was familiar with Solarflare and Mellanox zero copy setups in a previous fintech role, but at that time it all relied on black boxes (specifically out of tree kernel modules, delivered as blobs without DKMS or equivalent support, a real headache to live with) that didn't always work perfectly, it was pretty frustrating overall because the customer paying the bill (rightfully) had less than zero tolerance for performance fluctuations. And fluctuations were annoyingly common, despite my best efforts (dedicating a core to IRQ handling, bringing up the kernel masked to another core, then pinning the user space workloads to specific cores and stuff like that) It was quite an extreme setup, GPS disciplined oscillator with millimetre perfect antenna wiring for the NTP setup etc we built two identical setups one in Hong Kong and one in new york. Ah very good fun overall but frustrating because of stack immaturity at that time.