scheduler : Timers selection && performance

[deco33000%yandex.com@localhost]

Hello,

I see that a lot of timers have been implemented.
For instance, I am interested in the HPET timer because i want to test its performance to retrieve time against lapic timer.

I need the fastest way to get μsecs or nsecs (it can retrieve a cached value for very close requests).
Can we really use HPET in that fashion ? 

Should one only use tsc_get_timecount in amd64func.S or any rdtsc related functions found in cpufunc.S?

The goal is to be able to change some scheduler strategies and other security related functions.

Thanks

-- 
Jog