Am Thu, 13 Dec 2018 03:41:44 -0700 schrieb "Jan Beulich" <jbeul...@suse.com>:
> In a second step, let's consider what impact errors in calibration have. > Between two systems with exactly the same hardware crystal > frequency there of course is going to be some drift. The problem > though is - between the two calibrated clock values from two systems > you can't easily tell what part of the difference is a result of the > calibration being imprecise, and what part of it is because of the > crystals not providing the exact same frequency. Without knowing > the possible range of both errors, the argumentation of _one of > them_ being tolerable within a certain range to consider _both_ > systems sufficiently equal is at least questionable. We already have a knob for that, if a reference clock can not be provided: tsc_mode=always_emulate This would exactly cover the case there the assumed frequency that is available during the start of domU will be used after migration. Olaf
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