Re: Minor NTP question ....

["William A. Mahaffey III" <wam%hiwaay.net@localhost>]

On 04/19/15 12:45, Michael van Elst wrote:
> wam%hiwaay.net@localhost ("William A. Mahaffey III") writes:
>
> > on a good drift value, it could coast for some time w/o getting too far
> > off from its time source. I.e., I expect it to be maybe 1 sec. off after
> > an outage, not 6-10 sec. Am I understanding things correctly ?
> This assumes that your time source has a constant drift value.

Good point, so I decided to check, from fly.hiwaay.net:


[wam@fly, ~/Suspect, 4:58:50pm] 334 % ntpq -pn
     remote           refid      st t when poll reach   delay offset  
jitter
==============================================================================
-216.180.99.1    128.59.59.177    3 u  947 1024  377    0.340 10.937   0.434
-216.180.122.1   198.82.247.51    3 u  358 1024  377    2.706 12.187   1.078
+208.75.88.4     69.36.224.15     2 u  384 1024  377   79.207 -5.931   0.584
+98.143.24.53    64.250.229.100   2 u  472 1024  377   47.575 6.415   0.006
*204.2.134.163   187.253.153.32   2 u  969 1024  377   77.611 2.938   0.155
[wam@fly, ~/Suspect, 4:58:53pm] 335 % cat /var/lib/ntp/drift
-28.010
[wam@fly, ~/Suspect, DING!] 336 %

& we have a winner !!!! That -28-ish isn't so bad, but with so much 
difference between its 3 external sources, that could change whenever 
the specific external source changes .... Who knew ???? Thanks :-) ....

--

	William A. Mahaffey III

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