[LinuxPPS] offset 0 etc

[Dave Hart]

On Sat, Mar 17, 2012 at 07:15, Udo van den Heuvel <udovdh at xs4all.nl> wrote:
> On 2012-03-03 16:40, Udo van den Heuvel wrote:
>> Why do all of my boxes in this room, with gps, with DCF or no gps all
>> show a similar ntptime output like tis:
>>
>>   offset 0.000 us, frequency 0.000 ppm, interval 1 s,
>>   maximum error 16000000 us, estimated error 16 us,
>>   status 0x4041 (PLL,UNSYNC,MODE),
>>
>> ?
>
> I added a GPS18 to the box with the DCF clock.
> Works well, except:
> Offset, ppm etc remain at zero.
> Why is that?

Presumably because those machines are using the daemon loop discipline
rather than kernel loop discipline.  Are you passing -x or --slew to
ntpd?  Does your ntp.conf "tinker step" or "disable kernel"?

Cheers,
Dave Hart