I have a server using the SHM driver for which pool.ntp.org always shows a negative offset of around -3 to -8 ms.
Based on that information, should I use a time1 fudge factor on the SHM driver to try to center that offset spread around 0 on pool.ntp.org? Alternately, is it expected that “healthy” servers can have a nonzero average offset reported by pool.ntp.org, and that attempting to force a time1 offset would actually decrease the accuracy of time provided by my server?
I’m asking because there’s talk (e.g. this thread) about fudging SHM0 but I’m talking about fudging the SHM1 pps unit, which seems dangerous.
In short, I’d prefer to have all the green dots clustered around the x-axis on the offset graph, but I don’t want to make my server’s time worse to achieve that. Hope that makes sense. Thanks!