I'm running chrony 4.5 (which is the current default) on a commercial Microsoft Azure VM (Linux myVm 6.8.0-1021-azure). By default a PTP hardware clock is used as a time source: chrony.conf has no servers defined
refclock PHC /dev/ptp_hyperv poll 3 dpoll -2 offset 0 No external servers are defined. This is the default configuration. Current time source: hyperv_clocksource_tsc_page Available time sources: hyperv_clocksource_tsc_page hyperv_clocksource_msr acpi_pm This is the default setting. AFAICT chrony is happy, but is providing inaccurate time: Time is in error by 30-50 msec with substantial jitter. Dropping the PHC refclock and using nearby stratum 1's give much better results. Any suggestions for further debugging?
