On 06/27/2018 03:14, Andriy Gapon wrote: > > 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
We already do that for VMware hosts since r221214. https://svnweb.freebsd.org/changeset/base/221214 We should do the same for each hypervisor. Jung-uk Kim
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