[ntp:questions] no ntp synchronisation: 2s to 6s time shift !

Thierry MARTIN thierry-martin at ifrance.com
Fri Feb 22 14:54:17 UTC 2008


I will try this.


Martin Burnicki a écrit :
> Thierry,
> 
> Thierry MARTIN wrote:
>> Hi Martin,
>>
>> It seems that once again, you're about to save me ;-) !
> 
> ;-))
> 
>> So, ok my system has a Meinberg gps170pci board.
>>
>> As far as I can remember, when GPS signal is not there, NTP does not use
>> GPS refclock as a timesource.
> 
> By default not. This is because ntpd sees the board's "not synchronized"
> status.
>  
>> So i guess, you suggest that I use the DCF77 emulation or some other
>> feature from the board?
>> Could you please enlight me about this?
> 
> It's much easier. You run Linux, don't you?
> 
> The kernel module which lets ntpd use the card as reference time source can
> be loaded with a parameter which overrides the real board status and always
> tells ntpd the card is synchronized. Just load the module with the
> following parameter:
> 
> modprobe mbgclock pretend_sync=1
> 
> Of course this parameter should only be used for testing.
> 
> Martin




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