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

David J Taylor david-taylor at blueyonder.co.uk.invalid
Tue Mar 20 19:18:54 UTC 2012

"unruh" <unruh at invalid.ca> wrote in message 
news:Ur4ar.15722$IQ1.15335 at newsfe18.iad...
> On 2012-03-20, David J Taylor <david-taylor at blueyonder.co.uk.invalid> 
> wrote:
>> "unruh" <unruh at invalid.ca> wrote in message
>> news:d13ar.7952$GV1.7243 at newsfe12.iad...
>> []
>>> It is really really hard to imagine any gps device doing that.
>> Yes, I agree, and yet what just popped up in my mail box but a 
>> reference
>> to:
>>   "an inexplicable 1 second slip of 3 GPS based NTP time sources".
>> I have, of course, asked for more details!
> A one second slip I could understand-- eg Gamin 18x reporting over 1
> second after the associated second would lead to that. But a computer
> advancing at an hour per tick is way beyond that.
> Perhaps the 1 second slip tickled a bug in ntp with the LOCL clock--
> where the system then saw the GPS as a false ticker, went to LOCAL with
> a bad rate, and compounded the rate error by some sort of runaway
> process.

You are confusing two events here.  Ron had a problem with the PC running 
fast.  This was a separate incident where there was a 1 second slippage. 
When and if I get more details I will post them here.  There is no 
suggestion that the two are related.


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