Yo Richard! On Wed, 20 Nov 2019 16:02:32 -0600 Richard Laager via devel <devel@ntpsec.org> wrote:
> I now have a second stratum 1 server, with an independent setup. This > allows me to compare the two. Cool. > Why does ntp1 have this very specific > repeating pattern of local clock offset? It's roughly +7 us, -5 us, +2 > us, -4 us and then repeats again, over and over. Check your crontab, and other recurrent jobs. Those are way too large for an idle server. Could be a remote cronjob doing something like a log pull or other test. > I could try fiddling around with the polling interval. Nah, your jumps are too large for poll to have a noticeable effect on them. > Another idea might be to switch to the PPS refclock on ntp2 to see if > it behaves similarly with the ublox PPS. My bet is that it does. > As a second question, if you look at the ntp2 weekly graphs, there is > a single huge transient. Any idea what that might be? I've seen these > about once or twice a week since I put this in a couple weeks ago: > https://ntp2.wiktel.com/week/ Usually some sort of kernel stall. Likely some big job, or a backup, happened during those events. Less likely, but very possible, a disk drive or NFS mount hung the entire system for 50 ms. Also check the ntpd is locked to your PPS during the events. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 g...@rellim.com Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can't measure it, you can't improve it." - Lord Kelvin
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