| Re: [chrony-users] Comparing timekeeping performance with chronyd to ntpd |
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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] Comparing timekeeping performance with chronyd to ntpd
- From: Watson Ladd <watson@xxxxxxxxxxxxxx>
- Date: Tue, 30 Apr 2019 10:49:29 -0700
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On Tue, Apr 30, 2019 at 5:15 AM MUZZULINI Frank
<Frank.MUZZULINI@xxxxxxxxxxxxxx> wrote:
>
> Well, no daemon can be more precise than its sources.
> I would use independent measurements against the same source(s) individually using "ntpdate -q <addr>" and/or "chronyd -Q -f <addr.cfg>" (*). Preferably both.
That's our plan, but we're not sure what sort of analysis to do on the
results. (We will be using a GPS slaved rasbperry pi to gather the
results).
>
> Regards,
> Frank
>
> (*) <addr.cfg> containing "server <addr> iburst"
>
> -----Original Message-----
> From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
> Sent: Dienstag, 30. April 2019 10:15
> To: chrony-users@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [chrony-users] Comparing timekeeping performance with chronyd to ntpd
>
> > Ideally we would not need a GPS slaved machine to do the monitoring
> > and comparison, but methods that assume such a machine might also be
> > of interest if there is no other way to obtain the information.
> > Currently we are thinking of ntpd with the statistics command on on a
> > third machine, but don't really know how we would process the results.
>
> I'm not sure how useful that would be. If you need to compare the accuracy of the clocks synchronized by ntpd/chronyd, you need a more accurate and independent time source, e.g. a GPS refclock.
>
> --
> Miroslav Lichvar
>
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