[ntp:questions] stepping and slewing

Steve Kostecke kostecke at ntp.isc.org
Sat May 5 23:48:28 UTC 2007


On 2007-05-05, David Woolley <david at djwhome.demon.co.uk> wrote:
> Harlan Stenn <stenn at ntp.isc.org> wrote:

>> Assuming the OS plays by the rules, there is no difference in how long it
>> will take to slew a difference of X regardless of the choice of ntpd -gq,
>> ntpdate, sntp, whatever.

<snip>

>> Ditto for a step.
>
> Steps are instantaneous, although the daemon will sometimes take about 
> quarter of an hour to confirm the need for them.

In my experience 'ntpd -g' + iburst will step the clock to fix a large
offset within ~64 seconds of start-up; 'ntpq -gq' will step the clock in
less than 30 seconds.

-- 
Steve Kostecke <kostecke at ntp.isc.org>
NTP Public Services Project - http://ntp.isc.org/




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