It seems that TSC calibration in virtual machines sometimes can do more harm than good. Should we default to trusting the information provided by a hypervisor?
Specifically, I am observing a problem on GCE instances where calibrated TSC frequency is about 10% lower than advertised frequency. And apparently the advertised frequency is the right one. I found this thread with similar reports and a variety of workarounds from administratively disabling the calibration to switching to a different timecounter: https://lists.freebsd.org/pipermail/freebsd-cloud/2017-January/000080.html -- Andriy Gapon _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[email protected]"
