[Bug 208238] [Hyper-V] TSC frequency is not correctly detected: "calcru: runtime went backwards"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208238

Dexuan Cui  changed:

   What|Removed |Added

 Resolution|--- |FIXED
 Status|New |Closed

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[Bug 208238] [Hyper-V] TSC frequency is not correctly detected: "calcru: runtime went backwards"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208238

--- Comment #3 from Dexuan Cui  ---
The further patches on 11-CURRENT should fix the bug safely now:

https://github.com/freebsd/freebsd/commit/297e2d2f528a41d9a9614e9b34049801f6935b31
https://github.com/freebsd/freebsd/commit/28d2243294e521bd34a063a402382b21ad03b262
https://github.com/freebsd/freebsd/commit/dbf747e96c50495258170a73aa5a6ab288b8b958

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[Bug 208238] [Hyper-V] TSC frequency is not correctly detected: "calcru: runtime went backwards"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208238

--- Comment #2 from Dexuan Cui  ---
The tsc-calibration fix was temporarily taken back last Friday because we found
an interesting thing: with some kind of config, Xen can pretend to be Hyper-V
by mimicking the hypervisor CPUID signature (this is usually to make Windows VM
run better on Xen), but Xen doesn’t support Hyper-V timecounter, so the fix
causes an unexpected panic when FreeBSD VM runs on Xen in this case.

We're making another patch to better detect if the underlying hypervisor
supports Hyper-V timecounter or not:
https://lists.freebsd.org/pipermail/freebsd-current/2016-April/060519.html

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[Bug 208238] [Hyper-V] TSC frequency is not correctly detected: "calcru: runtime went backwards"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208238

Mark Linimon  changed:

   What|Removed |Added

   Assignee|freebsd-b...@freebsd.org|freebsd-virtualization@Free
   ||BSD.org

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