On 20150726_0252-0700, anxious...@gmail.com wrote: > On Sunday, 26 July 2015 05:30:04 UTC+1, CaT wrote: > > On Sat, Jul 25, 2015 at 11:32:53PM -0400, Gene Heskett wrote: > > > It is, once ntpdate has slammed the correct time into the system at boot > > > time, then ntp takes over. > > > > Unless I misremember, you don't even need ntpdate. Starting ntp with > > -g will do just fine (and it's the default config - I add -N). I don't > > even have ntpdate installed. > > > > -- > > "A search of his car uncovered pornography, a homemade sex aid, women's > > stockings and a Jack Russell terrier." > > - > > http://www.dailytelegraph.com.au/news/wacky/indeed/story-e6frev20-1111118083480 > > > > > > -- > > To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org > > with a subject of "unsubscribe". Trouble? Contact > > listmas...@lists.debian.org > > Archive: https://lists.debian.org/20150726040937.ga5...@zip.com.au > > Years ago, there was some concern about load on ntp servers. And we didn't > all have always-on connections. I guess that is still the case. Ntpdate could > be run from cron as often as necessary. It was usually good enough unless the > computer's internal clock drifted alarmingly. > > anxiousmac
Also years ago, and still today, there is approx which does a much more sophisticated analysis of the data stream of repeated queries of an ntp server. In addition to setting the local clock to the same time as the external reference clock as is done by both ntp and ntpdate, approx computes an estimate of *rate* of ticking of the local clock. Properly used, in a stable HVAC environment, it can keep the local clock synced with internet time with as few as one reading per week of the external internet time. It is my experience that internet time is vastly inferior to the precision of proper laboratory grade atomic clocks of a decade or two ago. Furthermore, no one really wants his computer clock to be scientifically correct to the point of being useful for running the data links to the space probe to Pluto. What everyone should want is just that their computer clock agrees with the computer clocks of the web sites with which they communicate. THAT is largely determined by social convention, which cares very little about logical scientific correctness. Here we see an example of a further meta-question concerning the socially correct words to use in covering up the underlying technical complexity. ;-) Best regards, -- Paul E Condon pecon...@mesanetworks.net -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20150726151406.ga8...@big.lan.gnu
