Here’s a few notes on CPUID and /proc/cpuinfo. I made a table for quick reference. What is CPUID? On x86 and amd64 CPUs, there is a large swathe of differences in features available to the software. Some CPUs ship with AES encryption support, others ship with virtualization support, almost all ship with a collection of SIMD (single instruction multiple data) instructions. The name of the game is to reduce CPU execution times using specialized instructions.
