I have checked the roundtrip delay with ntpq -p. It seems that I always have 0.147 ms. But I haven't monitored it properly, just each time I ran the command I got this value
On Wed, Apr 23, 2008 at 7:30 AM, maxime louvel <[EMAIL PROTECTED]> wrote: > HI again, > > I am thinking that NTP should behave correctly if the activity on the > nodes (small temperature, hence frequency variation) and on the network > (small latency of the switch) are roughly constant. > But if not it will have some trouble, either to compensate the frequency > change or to deal with the network delay latency. > > what do you think ? > > thanks, > > Maxime > > > On Wed, Apr 23, 2008 at 7:12 AM, maxime louvel <[EMAIL PROTECTED]> wrote: > > > Hi, > > > > - my network contains only one switch, and all the node are in the same > > room. > > Thus I don't think cabling is a problem. I still have to check the > > latency of the switch. > > > > - I can't use a GPS or other material. I though I wouldn't need any > > because I don't won't a great accuracy with the real time, just between my > > nodes. I also think it would have been easier and better to have a common > > high precision time source (GPS)... But I can't afford that ;) > > > > Do you have an explanation of the so different performances observed in > > your NTP synchronisations ? > > > > - I'm going to look at chrony, which at first glance seems usable in my > > case. > > > > - I am already using the -x option, to be certain to avoid any step. > > > > Maxime > > > > > > On Wed, Apr 23, 2008 at 2:10 AM, Unruh <[EMAIL PROTECTED]> > > wrote: > > > > > Steve Kostecke <[EMAIL PROTECTED]> writes: > > > > > > >On 2008-04-22, Unruh <[EMAIL PROTECTED]> wrote: > > > > > > >> Steve Kostecke <[EMAIL PROTECTED]> writes: > > > >> > > > >> ??? In my experience, on a Lan ntpd shows an internode offset of > > > about > > > >> 5-15 usec, and on the internet (ADSL) an offset of about 200usec. > > > > > > >Here's an aggregated plot of the node offsets on my LAN over the last > > > 24 > > > >hours. I see +3/-5 milliseconds, not anything near 5-15 microseconds. > > > > > > > > > > http://support.ntp.org/bin/viewfile/Users/SteveKostecke?rev=1;filename=typical_aggregate_lan_offsets.png > > > > > > I agree those are pretty bad. HOw are they hooked up? It looks like > > > one of > > > the hops is via a telephone modem! > > > > > > See www.theory.physics/chrony/chrony.html > > > Mind you those are running with maxpoll 7 not maxpoll 10 (Its my lan > > > and > > > ntp server, and I'll do what I want to.) > > > > > > > > > >-- > > > >Steve Kostecke <[EMAIL PROTECTED]> > > > >NTP Public Services Project - http://support.ntp.org/ > > > > > > _______________________________________________ > > > questions mailing list > > > [email protected] > > > https://lists.ntp.org/mailman/listinfo/questions > > > > > > > > > > > -- > > Maxime Louvel > > 0044 7964 5555 80 > > 43 Allen road > > Whitemore reans > > WV60AW Wolverhampton > > United Kingdom > > > > > > -- > Maxime Louvel > 0044 7964 5555 80 > 43 Allen road > Whitemore reans > WV60AW Wolverhampton > United Kingdom > -- Maxime Louvel 0044 7964 5555 80 43 Allen road Whitemore reans WV60AW Wolverhampton United Kingdom _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
