Anybody can create an X account and speak their mind, but not all minds are worth listening to. When John Carmack tweets, though, folks tend to listen. His latest musings pertain using a protracted fiber loop as an L2 cache of sorts, to hold AI model weights for near-zero latency and gigantic bandwidth.
Carmack came upon the idea after considering that single mode fiber speeds have reached 256 Tb/s, over a distance of 200 km. With some back-of-the-Doom-box math, he worked out that 32 GB of data are in the fiber cable itself at any one point.
