[EMAIL PROTECTED] (maxime louvel) writes: >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
Yes. Mine are around 200us (.2ms) >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
