[jsolson]

Some of this is not current.

Constant-rate TSCs are ~15-20 years old. Synchronized TSCs are at least ten.

Also RDTSC produces a 64-bit result, so it does not overflow at a rate of several Hz.

[datenwolf]

It's 64 bit on 64 systems. In the world of hard realtime applications there's still a huge armada of systems out there in the field running on 32 bit (think motion control, CNC machines, industrial robotics). If you're developing software that's concerned with this kind of precision, you might find yourself confronted with such "outdated" systems more often, than not.

Also see https://news.ycombinator.com/item?id=36814762