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Re: [Qemu-devel] [Bug 1775702] Re: High host CPU load and slower guest a


From: Alexandre DERUMIER
Subject: Re: [Qemu-devel] [Bug 1775702] Re: High host CPU load and slower guest after upgrade guest OS Windows 10 to ver 1803
Date: Thu, 23 Aug 2018 05:31:03 +0200 (CEST)

Hi,
proxmox users have reported this bug
https://forum.proxmox.com/threads/high-cpu-load-for-windows-10-guests-when-idle.44531/#post-213876

hv_synic && hv_stimer  hyperv enlightments fix it


(seem to be related to some hpet change in windows)



----- Mail original -----
De: "Lemos Lemosov" <address@hidden>
À: "qemu-devel" <address@hidden>
Envoyé: Mercredi 1 Août 2018 08:43:46
Objet: [Qemu-devel] [Bug 1775702] Re: High host CPU load and slower guest after 
upgrade guest OS Windows 10 to ver 1803

This bug affect me 

-- 
You received this bug notification because you are a member of qemu- 
devel-ml, which is subscribed to QEMU. 
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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