> I have a Windows 10 pro (64bit) long time running as a libvirt/KVM guest > that I think Windows Update finally narfed. > > The hardware is a supermicro motherboard with dual Intel E5-2640 CPUs > for a total of 40 threads and 64GB > > The guest is allocated 2sockets, 5cores, 2 threads and 32GB of RAM. > (I've also tried 1 socket, 20 cores, 1 thread and 1s10c2t -- no help) > > In an SSH session to the linux host (CentOS7 - up to date), htop shows 1 > core pegged and abnormal distribution of load (like it used to) even > with fun little tools in Windows like the PowerToy -> CPUStress64.exe > > (i.e. the head CPU will show 90-99% and next thread in HTOP will show > like 10% which then trails off to like 5%) > > Even if I tell CPUStress64.exe to load up 10 or 15 threads worth of > 100%. > I think the processor type and configuration options are most important. I am also having win10 on el7 and weird idle load of 35%. This win10 is also constantly writing to disk. Best is to disable al diagnostics services you do not use. I also noticed that el9 is smoother with win10 guests, I copied the same guest and there it is around 14%*. But if any one has an advice to get this to levels of a linux guest doing nothing, I am very anxious to hear about it. *not exactly same processors.

I will say one thing that I noticed is: when giving the guest 8 cores and not setting the topology, windows device manager shows 8 CPUs but the task manager only shows 2. Feh. Windows.