[ntp:questions] Which time source is ntp using

Brian Utterback brian.utterback at oracle.com
Wed Jul 12 15:37:46 UTC 2017


Strictly speaking, it is using both. A PPS signal can only be used on a 
system clock that is within half a second of the correct time. In 
essence the part of the timestamp that is of a precision of one second 
and up is coming from the 176.9.72.17 system, while the part of the 
timestamp that is in fractions of a second is coming from the PPS.

Hope that helps.

On 7/11/2017 10:53 PM, Chip wrote:
> All,
>
> I have set up a raspberry pi as a NTP server.
>
> The Pi is performing flawlessly.
>
> when I run the ntp -pn, I get the following output
>
>      remote           refid      st t when poll reach delay offset  
> jitter
> ============================================================================== 
>
>  127.127.1.0     .LOCL.          10 l  27h   64    0 0.000 0.000   0.000
> o127.127.20.0    .GPS.            0 l   58   64  377 0.000 0.007   0.004
> *176.9.72.17     192.53.103.104   2 u   44   64  377 136.644 1.221   
> 0.720
> +46.254.216.9    89.109.251.21    2 u   58   64  337 177.067 0.041   
> 2.734
> -69.10.161.7     144.111.222.81   3 u   36   64  377 69.135 15.589   
> 0.680
> +96.244.96.19    192.168.10.254   2 u   46   64  377 58.373 0.809  13.308
>
> Is the pi using the GPS pps signal as the reference clock or the clock 
> at 176.9.72.17 which has
> the * infront of it?
>
> Thanks
>
>
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> http://lists.ntp.org/listinfo/questions


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