** Also affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-azure (Ubuntu)
Status: New => In Progress
** Changed in: linux-azure (Ubuntu)
Importance: Undecided => High
** Changed in: linux-azure (Ubuntu)
Assignee: (unassigned) => Marcelo Cerri (mhcerri)
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https://bugs.launchpad.net/bugs/1715489
Title:
[Hyper-V] Read TSC frequency from a synthetic MSR
Status in linux package in Ubuntu:
Confirmed
Status in linux-azure package in Ubuntu:
In Progress
Status in linux source package in Xenial:
New
Status in linux-azure source package in Xenial:
New
Bug description:
It was found that SMI_TRESHOLD of 50000 is not enough for Hyper-V
guests in nested environment and falling back to counting jiffies
is not an option for Gen2 guests as they don't have PIT. As Hyper-V
provides TSC frequency in a synthetic MSR we can just use this information
instead of doing a error prone calibration.
Upstream commit here:
https://github.com/torvalds/linux/commit/71c2a2d0a81f096a2932fccb39a500116fece554
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