Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Changed in: linux (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1715489 Title: [Hyper-V] Read TSC frequency from a synthetic MSR Status in linux package in Ubuntu: Confirmed 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1715489/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
