[Qemu-devel] [Bug 1775702] Re: High host CPU load and slower guest after upgrade guest OS Windows 10 to ver 1803

[costinel]

hv_synic && hv_stimer only reduces the cpu from 40-50% to 4-5%.
still expecting under 1% like linux guests.

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https://bugs.launchpad.net/bugs/1775702

Title:
  High host CPU load and slower guest after upgrade guest OS Windows 10
  to ver 1803

Status in QEMU:
  New

Bug description:
  After upgrading Windows 10 guest to version 1803, guests VM runs
  slower and there is high host CPU load even when guest is almost idle.
  Did not happened with windows 10 up to version 1709.

  See my 1st report here:
  
https://askubuntu.com/questions/1033985/kvm-high-host-cpu-load-after-upgrading-vm-to-windows-10-1803

  Another user report is here:
  https://lime-technology.com/forums/topic/71479-windows-10-vm-cpu-usage/

  Tested on: Ubuntu 16.04 with qemu 2.5.0 and i3-3217U, Arch with qemu
  2.12 i5-7200U, Ubuntu 18.04 qemu 2.11.1 AMD FX-4300. All three
  platform showing the same slowdown and higher host cpu load with
  windows 10 1803 VM compared to windows 10 1709 VM.

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