The little I know about NTP surveys, in chronological order: 1989, Mills, http://www.eecis.udel.edu/~mills/database/papers/ccr.ps
1994, James Guyton, I only know of this because it is referenced in Minar below. 1997, Mills, http://www.eecis.udel.edu/~mills/database/papers/survey5.ps 1999, Nelson Minar, http://alumni.media.mit.edu/~nelson/research/ntp-survey99/ 2005, Cristina Duarte Murta and Pedro R. Torres Junior, http://ntpsurvey.arauc.br/ Any other URL's I should know of? Interesting numbers for time evolution of count of stratum-1's: 1994: 66 1997: 220 1999: 957 2005: 533 Minar (1999) reveals that vast majority (657 of the 957) of claimed Stratum 1's that he counted are in fact LCL (not obviously tied to a refclock). The decrease between 1999 and 2005 numbers may reflect not a decrease in Stratum 1's that are locked, but in fact a decrease in misconfigured NTP hosts. (Minar identifies a specific Red Hat distribution responsible for many of the misconfigurations, and I suspect that few of these are still alive.) I would be most interested if the 2005 survey (which the authors say is in the publication process) reveals some details about the stratum-1's and their diversity of refclocks. At the time of Minar's 1999 survey GPS was far and away most common, and I suspect that diversity of refclocks has degraded even more since then. Tim. _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
