[ntp:questions] PSYCHO PC clock is advancing at 2 HR per second

David J Taylor david-taylor at blueyonder.co.uk.invalid
Wed Mar 21 06:20:58 UTC 2012

"unruh" <unruh at invalid.ca> wrote in message 
news:dG5ar.18461$pc1.11947 at newsfe11.iad...
> No confusion. I understood completely. Ron had a machine on GPS which
> ran away. You got a report of a 1 sec slippage. The question is whether
> or not a 1 sec slippage in the GPS could trigger a runaway on a machine
> which also had LOCL as a server.


> I simply do not believe that the GPS
> sudenly went wild and delivered time at a rate 1000 times the UTC rate.

It seems unlikely.

> Something on his system triggered and instability, and all he had
> running was a GPS and the LOCL server. Now, usually the machine would
> take the GPS signal and it certainly could not engage in that kind of
> runaway behaviour. It could however engage in something like a 1 sec
> slippage. How could that trigger an instability?

I would regard a system which was not at least somewhat protected against 
failure of a GPS device as not being correctly configured.  Perhaps the 
NTP simulator could be used to predict behaviour in the case you suggest, 
but I have no experience with that tool.


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