[ntp:questions] NTP absolute accuracy?

Juyong Do jdo at stanford.edu
Fri Jun 29 23:06:50 UTC 2007


Does anyone know any survey or paper measuring absolute time accuracy over 
NTP? I saw statistics about offsets, RTT, and dispersion but am not sure how 
well those parameters reflect or are correlated with absolute accuracy of 
each NTP servers and clients.

To my mind, the only way to measure the absolute accuracy (difference from 
UTC or GPS time) would be to physically bring a GPS receiver to each NTP 
clients and compare the timing bases. It is certainly not feasible for a 
large scale survey but I guess there should have been someone who've done 
this before. Let me know if there is.


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