qemu/kvm vs top - users - Fedora Mailing-Lists

Sunday, 9 July 2017

I'm running a Windows 10 VM under QEMU/KVM, using libvirt via the
Virtual Machine Manager. I have the VM configured with 8GB assigned to
the VM with hugepages (of 16GB total in the box) and VFIO passthrough
of my Nvidia graphics card. I have also pinned 2 of my 4 CPU cores
(i.e. 4 threads) for gaming. CPU is an i7-3770.

Sometimes the GPU runs hot and I pause the VM to let it cool, however
'top' shows qemu-system-x86 sucking up over 25% of CPU. OTOH the KDE
System Activity tool shows it using only 3%. Clearly they can't both be
right.

Is this a bug in 'top'?

poc