"Richard B. Gilbert" <rgilber...@comcast.net> wrote in
news:tlsdnq2e26bblbnxnz2dnuvz_sydn...@giganews.com: 

> nemo_outis wrote:
...
>> I fail to see the value or relevance of "500ppm satisfies 98% of
>> computer clocks" if some other number, perhaps 5000 ppm, could
>> satisfy yet even more than 98% of computer clocks with no downside -
>> as indeed seems to be the case!  Chrony, whatever its other merits
>> and demerits, is an "existence proof" for this proposition.


> I can't follow Dave's math but I'm reasonably sure that there is a
> good reason for the 500 PPM limit.  Since almost all computer clocks
> can meet this criterion I'm not going to worry about it.

Hmm, "faith-based" ntp?  Not for me.  If there is a "good reason" I'd 
like to hear it - 500 ppm has the smell of arbitrariness about it.

 
> If you have a computer with a frequency error of more than 500 PPM,
> you can either get it fixed or hack the ntpd code to allow +/- 600 or
> 6000 or whatever PPM.
 
Of course, one can hack the code.  But one should not have to do this to 
overcome arbitrarily-imposed unjustified constraints.  That Chrony can 
manage much more than 500 ppm may not not be absolutely probative in this 
regard but it sure is strongly indicative.

Regards,







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