Thank you for the extended explanation again! I don’t view the RTC as a correct source. I was just playing around with very wrong RTC values and wanted to verify if chrony corrects them. I mean you can always do this with timedatectl after disabling chronyd, but it is just tedious. Anyway, not so important I guess.
> Am 09.08.2024 um 21:36 schrieb Bill Unruh <un...@physics.ubc.ca>: > > The rtc works correctly if it counts out its own seconds. It's seconds need > not be the same as UTC seconds for it to work although they should not be too > far off. It is not supposed to an accurate source of UTC time. Just good > enough to start of nptd or chrony with roughly ( within a few hours) the > correct UTC time. After that you use either a good clock (atomic clock, GPS > time,..) or an internet ntp server to get the time reallywall ( to msec or > microseconds which an RTC cannot do and was never designed to do) For nsec > accuracy you need to put in much more work and money, and it is easy to get > wrong (see the brouha about 10 years ago when neutrinos were measured to go > faster than light. It turned out to be clock problem at nsec accuracy, not a > neutrino problem. > And that was a multi million dollar experiment, with some really very bright > people running it. It turned out to be a bad fibre optics connection between > the gps receiver and the experiment, which delayed the time signal by a nsec > or so). nsec are hard. microseconds are cheap (<$100) and easy (even I can do > it). > > William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273 > Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324 > UBC, Vancouver,BC _|_ Program in Cosmology |____ un...@physics.ubc.ca > Canada V6T 1Z1 ____|____ and Gravity ______|_ theory.physics.ubc.ca/ > >> On Fri, 9 Aug 2024, Jan Claußen wrote: >> >> [CAUTION: Non-UBC Email]Well, it is simple. I want to compare if the RTC >> syncing was successfull and compare >> the times like I can with timedatectl. This way you can visibly verify that >> the RTC works correctly. I don't >> want to calculate anything for this. >> It is just one line more to add to the rtcdata command. I really don't >> understand why this was never >> implemented. -- 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.
