Hi David! On 5 June 2013 06:58, David J Taylor <[email protected]> wrote:
> > Miguel, > > I notice a step in the blue (ntp02) graph in: > > > http://www.flickr.com/photos/**miguelbarbosagoncalves/**8955346508/<http://www.flickr.com/photos/miguelbarbosagoncalves/8955346508/> > > and I think in the red (ntp04) graph as well. This suggests some change > in connectivity between your monitoring PC and both servers, so perhaps a > network change. Unless your stratum-1 server took a 2 millisecond step, > which seems unlikely. > I believe something has happened but not on my side. The offset for ntp02 changed its sign but kept the absolute value. > Their ntp02looks well behaved, but their ntp04 is clearly not well > behaved, and disappointing for public service. In my own plotting program: > Indeed! Very disappointing! And it is payed by my taxes!!! :-( > > http://www.satsignal.eu/**software/net.htm#NTPplotter<http://www.satsignal.eu/software/net.htm#NTPplotter> > > I find it useful to be able to plot the offset versus time of day, as > regular temperature variations tend to stand out - at least in my > environment where the heating switches on at the same time every morning. > For comparison on a similar time scale, you might like to look at my > Windows LAN-synced PCs here: > > > http://www.satsignal.eu/mrtg/**performance_ntp.php?period=**week#windows<http://www.satsignal.eu/mrtg/performance_ntp.php?period=week#windows> > > so even if their servers were running Windows, they could be doing far > better than that your graph suggests. Could you plot offset versus time of > day? > Will do that later today. I am also gathering the offset of my stratum 1 in the same location against ntp02 and ntp04 and another set of stratum 2 servers located in an University. The first 24 hours look rather interesting: ntp02 and these new servers are quite stable (around 1 ms offset in absolute value) and ntp04 keeps doing crazy things. Once I have enough data I will contact them. Cheers, Miguel _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
