[ntp:questions] 500ppm - is it too small?
Richard B. Gilbert
rgilbert88 at comcast.net
Mon Aug 17 18:24:29 UTC 2009
nemo_outis wrote:
> "Richard B. Gilbert" <rgilbert88 at comcast.net> wrote in
> news:poydnd1spod4pBTXnZ2dnUVZ_vudnZ2d at giganews.com:
>
>> I still haven't seen any argument that supporting a value greater than
>> 500 PPM is worth the trouble!
>
> I still haven't seen any evidence that there is much trouble - only
> anticipatory speculative whinging.
>
> Nor, for that matter, has there been much other than speculation and vague
> anecdotal recollections that the 500 ppm limit *may* have had some
> justification and not been entirely arbitrary.
>
> This doesn't inspire much confdence about the documentation of the
> architecture and design decisions regarding ntp.
>
> Regards,
>
>
I think "Das Buch" a/k/a "Computer Network Time Synchronization: The
Network Time Protocol" by David L. Mills might help you understand the
design and how it was derived.
See:
http://www.amazon.com/s/ref=nb_ss?url=search-alias%3Daps&field-keywords=NTP&x=0&y=0
I think you will need some background in "control systems", "phase
locked loops" and other such esoterica. I don't pretend to understand
the math. I simply use the software derived from it to synchronize my
clocks.
NTPD does that nicely!
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