[Bug 195819] TSC calibration can hang FreeBSD in Hyper-V Generation 2 VM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195819

--- Comment #22 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Ed Maste from comment #21)

It looks the i8254 PIT counter emulated by Hyper-V is not reliable and I made a
workaround patch here:
https://github.com/dcui/freebsd/commit/07acbd8a3771adba9ac0fca807ec629ff05a807c

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