But be more careful with CPU clock count on linux, so the fasttimer values are much more accurate than they were the last time we were with RDTSC, in absolute terms - back in the right order of magnitude anyway.
Also change many instances of Mhz to MHz.
Also some minor comment fixes.
more reliable fix based on feedback from Richard. dicked with the Darwin results too since those seemed wrong based on the same feedback (also covered in test plan).