[LinuxPPS] Experiments with HZ

[clemens at dwf.com]

> Hi,
> 
> Has any one experimented with different HZ values and NTP performance ?
> 
Yes.
Stick with 100Hz.
The kernel has some ntp stuff in it, but the time constants there are ONLY for
100Hz.  When I tried 1000Hz, instead of the time offset closing in on zero
exponentially, it oscillated with a large amplitude, for days around the 
correct
value.

So, the kernel either needs a set of time constants for each of the current
4 choices for Hz, or (better) some side calculation of the time constants 
dependent on what Hz is chosen.

Till that happens, use 100Hz.
-- 
                                        Reg.Clemens
                                        reg at dwf.com