Re: GNU/Linux System Clock Drift

Le 12-05-2025, Lawrence D'Oliveiro <ldo@nz.invalid> a écrit :

On 10 May 2025 16:09:58 GMT, Stéphane CARPENTIER wrote:
>

Now, the solution is to check for an atomic clock who doesn't drift
because at the same time it's more precise and there are more than one
clock, so they can average the drift and stay stable.

>
Every clock drifts. It’s just that an atomic clock drifts less than a
quartz one.

 Yes. I should have said more precisely, that the ntp doesn't check about
one atomic cloak hardware but to the atomic clock system, which is more
precise.
 

You can reduce the random error by averaging over multiple clocks. For
example, if you have 10 clocks, all with the same random error rate, then
by averaging their readings, you can achieve greater accuracy by a factor
of √10 ≅ 3.

 Agreed, but it's so precise, I will never been able to see the drift
during my life. In practice, I can consider it doesn't drift.