[ntp:questions] Solving the right problem

[David Woolley]

Hal Murray wrote:

>     You can hand tune the drift to get within a second per day or so
>       (Some Linux kernels are broken - screwup on reboot)

Hand setting is possible to about 30 seconds a year, as long as the 
machine is lightly loaded, has no aggressive power management, and is in 
an air conditioned computer room.

You can use a portable radio clock or wristwatch as the reference, and, 
with a bit of practice, can read the time to 200ms or batter against 
that, then baseline the drift over about a week and calibrate it out.