On Thu, Oct 12, 2023 at 02:58:52AM +0530, Abhijith Sethuraj wrote: > Hello, > > I'm trying to understand what "estimated error" means in the context of > `chronyc sources -v`. For example, we see `-308ns[ -582ns] +/- 17us` for > one of our sources. Does that mean that even though our recent offsets have > been in the order of ns, the actual error is close to microseconds?
It's the NTP root distance. It estimates maximum error assuming the extreme asymmetry in network delay where one direction has no delay and the opposite direction has the whole of measured network delay. > Secondly, `chronyc sourcestats` says that our offset for a particular > source is always in the order of ns. Is that based on the offset between > the system clock and stratum-1 clock (thereby, including root dispersion > and root delay), or, between the system clock and the last sample that we > got back from our NTP server? More of the latter. It's the offset of the system clock to the local estimate of the remote source. If it's the only selected source (no combining), it should be close to zero. -- Miroslav Lichvar -- To unsubscribe email [email protected] with "unsubscribe" in the subject. For help email [email protected] with "help" in the subject. Trouble? Email [email protected].
