Hal Murray wrote: >>How many minutes, hours, or days of "holdover" with reasonably correct >>time you may get depends on the quality of the local clock, the >>stability of the temperature, the phase of the moon and the whims of the >>gods! > > > We can at least do a bit of arithmetic. > > There are 86400 seconds in a day. If your clock is off > by 11 ppm, it will drift 1 second per day. > > If your machine is in an airconditioned machine room, the > average temperature is probably pretty stable. I'd guess > a second per week would be conservative. > > If your machine is in an environment with poor temperature > regulation, the day to day average temperature is probably > the important consideration. > Yes it works that way, I have systems ( embedded, linux + RT ) running in a reasonably climatised room that have to do exactly 18000 sample cycles per 30min interval. When I have fixed the timer value to make it fit I can leave it alone for quite some time : weeks, month,..
But I get an imediate error when the gas tank for the heating is empty ;-) To return to my question: Does ntpd follow this deterioration in any way? uwe _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
