Hi thanks every body, I am looking at the other solution and see what's the best for me.
- My switches shouldn't be overloaded but I have to check that. Any idea of how ? Network sniffing ? theory ? - I think I have a problem with the temperature, indeed I have let only ntpd run on the node for a week-end and the offset between the two cards was quite good. Then I have run my 24H script which has obviously increased the temperature. - I have understood that ntp should be able to manage what I want, but you seem divided on this issue ;) Maxime On Tue, Apr 22, 2008 at 5:04 PM, Unruh <[EMAIL PROTECTED]> wrote: > [EMAIL PROTECTED] (maxime louvel) writes: > > >On Tue, Apr 22, 2008 at 2:42 PM, Steve Kostecke <[EMAIL PROTECTED]> wrote: > > >> On 2008-04-22, maxime louvel <[EMAIL PROTECTED]> wrote: > >> > >> > My goal is to achieve a synchronisation between the nodes (not > >> > with the public NTP server) within 50 usec. > >> > >> You may want to explore other synchronization options such as IRIG, > >> distributed PPS, or a distributed 10MHz clock. > > > >Thanks I'm gonna look at some other synchronisation solution. > > >> > >> > >> >I don't care if the synchronisation to the public NTP is accurate > >> >around half a second. > >> > >> You're displaying a common misconception about NTP. > >> > >> The goal of NTP is not explictly to synchronize clocks to "the one > >> true time". Rather, NTP synchronizes clocks to a common time base. A > >> "better" time base, and a "better" distribution method, allows tighter > >> synchronization between nodes. > >> > >> It so happens that UTC (via GPS or HF Radio or UDP) is a ubiquitous, > >> stable, and relatively inexpensive time base. A side effect of using > UTC > >> as your time base is that your clocks are synchronized to the correct > >> time. > > > >Sorry I haven't express myself correctly. What I meant is that I want an > >accuracy of 50 usec within my subnet and I want my whole subnet to be > >synchronised to UTC with an accuracy of 1 second or less if possible. > > > He is saying that ntp is designed to do the former, and if you include an > external reference you get the latter for free. How badly overloaded are > your switches? > > > >> > >> > >> -- > >> Steve Kostecke <[EMAIL PROTECTED]> > >> NTP Public Services Project - http://support.ntp.org/ > >> > >> _______________________________________________ > >> questions mailing list > >> questions@lists.ntp.org > >> https://lists.ntp.org/mailman/listinfo/questions > >> > > > > >-- > >Maxime Louvel > >0044 7964 5555 80 > >43 Allen road > >Whitemore reans > >WV60AW Wolverhampton > >United Kingdom > > _______________________________________________ > questions mailing list > questions@lists.ntp.org > https://lists.ntp.org/mailman/listinfo/questions > -- Maxime Louvel 0044 7964 5555 80 43 Allen road Whitemore reans WV60AW Wolverhampton United Kingdom _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions