[ntp:questions] 500ppm - is it too small?
David J Taylor
david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Thu May 7 17:28:01 UTC 2009
Richard B. Gilbert wrote:
> I'm not here to make people feel good!
> I've checked the hardware available to me and none is worse than 50
> PPM. That's two PC's running Windows XP, three Sun Ultra 10
> Workstations running Solaris 8, 9, and 10, two DEC Alpha workstations
> running VMS.
Thanks for that. Possibly, on the PCs are representative of the hardware
class I'm considering.
> The specifications for NTPD say that it will correct errors less than
> or equal to 500 PPM.
Hence the title of this thread.
> I beleive that hardware outside of this limit can properly be
> described as broken! Would *you* tolerate a clock, computer or wall,
> that gained or lost more then 43 seconds per day? Our forefathers,
> limited to springs, gears and pendulums could do better than that.
As I hope I mentioned earlier, it may not be hardware, but some BIOS or OS
power-saving scheme, or something else I've overlooked, which is stopping
NTP from working. I am trying to get more details.
I do completely agree that a clock with 43s per day error would be one I
would reject! All the non-radio and non-NTP clocks here do better than
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