[ntp:questions] what about clockspeed and NTP ?

Cyrille37 cyrille37 at gmail.com
Tue Nov 6 16:06:56 UTC 2007


On 6 nov, 15:40, Martin Burnicki <martin.burni... at meinberg.de> wrote:
> Cyrille37 wrote:
> > Hello
> > I'm a bit confused with those 2 concepts for keeping computer on the
> > right time :
> >  - ntpd
> >  - clockspeed and taiclock
> > Is ntpd look at the computer's clock derivation like clockspeed do ?
> > Is it a good idea to have clockspeed and ntpd running together on the
> > same computer ?
>
> It's never a good idea to let 2 different programs try to discipline the
> system time in parallel.
>
> As far as I know clockspeed can be used to compensate the drift of the
> system clock continuously. However, you have to determine the amount of the
> drift manually, and pass the correction value to clockspeed. The accuracy
> you can achieve depends on the accuracy at which you have measured the
> drift. E.g. you set the system time correctly and see how much it is off
> after a couple of hours.
>
> Ntpd can be configured to query the correct time from a reference time
> source in regular intervals, so it can determine the clock drift by itself
> and compensate it. The advantage is that you don't have to measure the
> drift manually, and ntpd compensates the drift even if the drift value
> changes, e.g. due to temperature changes.
>
> Regards,
>
> Martin
> --
> Martin Burnicki
>
> Meinberg Funkuhren
> Bad Pyrmont
> Germany

Thanks a lot Martin. Now it's clear for me : I'll use Ntpd.

Cyrille




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