[Pkg-libvirt-maintainers] Bug#672720: libvirt-bin: KVM with usb-tablet causes constant CPU load

[Kari Pahula]

retitle 672720 libvirt-bin: KVM with usb-tablet causes constant CPU load
thanks

On Sun, May 13, 2012 at 06:23:39PM +0200, Guido Günther wrote:
> I'd check the monitor commands issued by libvirt and reproduce this with
> stand alone kvm. Libvirt shouldn't be doing anything special here and
> you should be able to check kvm's state. See also:

I think I found the culprit: usb-tablet.

I tested this with a minimal kvm command line and saw the cpu load
drop to zero, even without pausing anything, with a running but idle
virtual machine.  When I started dropping options from virsh's kvm
command line I saw that removing "-device usb-tablet,id=input0"
stopped kvm's cpu hogging.

I'm using my virtual machines as development environments for web
sites and can just drop <input type='tablet' bus='usb'/> from my virsh
domain config without trouble.

I'll leave it to you to decide what to do with this information.  Can
anyone reproduce this?