RE: Windows Guest on KVM running "single core" after windows update
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.