Wall clock accuracy

[Rune Torgersen]

Sorry for double post...
 

> -----Original Message-----
> From: Eugene Surovegin [mailto:ebs at ebshome.net] 
> Sent: Tuesday, August 09, 2005 11:41
> It's not small drift (I usually have clock accuracy within +-50ppm), 
> but still is much less than maximum 1024ppm NTPD can deal with.

My bigger problem with the walltime is that time_nsec should have been
1000000, not 999848 to begin with. If it had been, I would probably
never even have noticed it.

The thing is that that value is set based on a value I cannot find any
reference as how was chosen. Looks to be a leftover when porting PPC
fron i386 once upon a time.

time_nsec basically gets is value (via some macros) from
CLOCK_TICK_RATE, which is defined in asm-ppc/timex.h to be 1193180

In my opinion, time_nsec should have been calculated based on the actual
clock input rate to begin with (like in calibrate_decrementer()).