Re: [rtl] do_gettimeofday().

["gzeljko" <gzeljko@sezampro.yu>]

From: gzeljko <gzeljko@sezampro.yu>
> I'm just testing RTLinux (and hardware).
> Motivated with this thread I write small test program  (appended)
> for uniprocessor pentium machine to know what we are talking about.
> 
> On my test machine (K6/200) it givs stable (2-3 ppm) drift cca. 160 ppm.
> 

Exploreing farther I found it's easy solvable, by patching RTLinux to make 
scaler_pentium_to_hrtime public and writeing own calibration routine.
It's works nice, drift is 0 (as it's depend of software).

Now, I'm wondering why scaler_pentium_to_hrtime is private? Probably
there is reson. (given that RTLinux is really nice work).

But, time calibration is definite trade-off: spent time vs accuracy, so it's
worth IMHO to allow customisation (calibration module?).

gzeljko