[ntp:questions] Meinberg NTP Software--Time Accuracy

Richard B. Gilbert rgilbert88 at comcast.net
Fri Jun 26 12:50:15 UTC 2009


David J Taylor wrote:
> Richard B. Gilbert wrote:
>>> W. eWatson wrote:
> []
>>>> What sort of accuracy might I expect from my 4 servers, as mentioned
>>>> above? Are those servers applicable to any site in the USA or
>>>> Canada?
> []
>> Assuming reasonably good servers with low delay, I would expect to get
>> +/- 10 milliseconds or better.  The absolute best you will be likely
>> to see occurs between 1AM and 6AM local time; the world (your part of
>> it) is asleep, the net is unbusy. . . .
> 
> +/- 10 milliseconds using what client OS?
> 
> I ask as I haven't seen it that good here with Windows (which is what 
> the OP has, I believe).
> 
> David

The last time I looked closely at Windows timekeeping, clock "ticks" 
were every 17 milliseconds or something like that.  My desktop system is 
Windows XP and seems to be within a second or so.  I have no requirement 
for better time than that.

My Solaris systems, OTOH, run NTPD and keep time to within a +/- 10 
milliseconds over the network.  One has a GPS reference clock and its 
time seems to be within 100 usec or so.  It MAY be far better than that 
but I lack the means to determine how much better.




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