Thanks, that's very helpful. Here's what I see:
S Name/IP Address Auth COpts EOpts Last Score Interval Leap ======================================================================= * 1PPS N -P--- -P--- 1 1.0 -7ns +31ns N D foobar N -P--- -P--- 3 1.0 -1550ns +2091ns N Going through the man pages, "foobar" is in "D" state when its root distance (in a recent measurement) is greater than combinelimit * root distance of current best source's root distance. So, I tried increasing combinelimit to a higher value and it started combining. The 1PPS signal is coming from a time server appliance that has a good clock and uses a GNSS ref clock as well; "foobar" is another good source in the same site. In such a case, is it best to combine both 1PPS and "foobar" sources; or should I just use 1PPS (if available) and fallback to other sources if 1PPS isn't available (that is, don't forcefully combine them)? Also, one thing that I noticed is that if I stop the 1PPS signals, it's not falling back to "foobar"; 1PPS remains as the best source. Should I add something in the configs to make this work? S Name/IP Address Auth COpts EOpts Last Score Interval Leap ======================================================================= * 1PPS N ----- ----- 228 1.0 -200us +200us N D foobar N ----- ----- 1 1.0 -2650ns +1040ns N Thanks in advance, Abhijith On Tue, Aug 20, 2024 at 3:45 PM Miroslav Lichvar <mlich...@redhat.com> wrote: > On Tue, Aug 20, 2024 at 03:23:03PM +0530, Abhijith Sethuraj wrote: > > Hello, > > > > We have a 1PPS input to the NIC and we're planning to run chrony to use > > 1PPS as an additional refclock, in addition to getting time of day via > NTP. > > When we tried this out, we're not entirely sure if things work fine as > the > > source that gives time of day shows up as "unusable" in `chronyc > sources`. > > The "?" character in the sources means a different state than those > previously listed. Run chronyc selectdata -v to get the actual > selection state. > > -- > Miroslav Lichvar > > > -- > To unsubscribe email chrony-users-requ...@chrony.tuxfamily.org > with "unsubscribe" in the subject. > For help email chrony-users-requ...@chrony.tuxfamily.org > with "help" in the subject. > Trouble? Email listmas...@chrony.tuxfamily.org. > >
