How to detect if RDTSC returns a constant rate counter value?

Question

It seems most newer CPUs from both AMD and Intel implement rdtsc as a constant rate counter, avoiding the issues caused by frequency changing as a result of things like Turb

Answer 1

I do count the number o ticks in a second and then compare to the informed clock at /proc/cpuinfo. It only works with dynamic clock disabled. See the source: https://github.com/petersenna/rdtscbench