[ntp:questions] frequency adjusting only

Unruh unruh-spam at physics.ubc.ca
Sat Apr 19 04:59:51 UTC 2008


Harlan Stenn <stenn at ntp.org> writes:

>>>> In article <dda529d0804160332l3bcb4e43l5623478bcd8f4fa at mail.gmail.com>, m.louvel at gmail.com (maxime louvel) writes:

>maxime> Hi, I would like to know if NTP (and particularly ntpd) is able to
>maxime> synchronise a clock, only playing with the frequency.  I want to
>maxime> avoid any step in the clock that would probably screw up my network
>maxime> appli.

>It's *possible* and it can be a really bad idea.

>For most folks, only steps *backward* are a problem.

Actually, ntp does synchronize the clock by "playing with the frequency
only" unless the step size is so large (128ms by default but up to 600sec
by option) that it will step. 

>-- 
>Harlan Stenn <stenn at ntp.org>
>http://ntpforum.isc.org  - be a member!




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