Re: [Xen-users] High CPU in idle Windows guest

["Manfred Haertel, DB3HM" <Manfred.Haertel@xxxxxxxxxxxx>]

Christian Costa schrieb:

> Please see this:
> http://lists.xenproject.org/archives/html/xen-users/2014-07/msg00441.html
>
> I believe it's the same issue I've come across. You can easily verify
> that by disabling USB on the VM completely and see how it goes.
>
> If that's the proble, a sort of workaround would be to set usb=none but
> then the mouse won't track properly when you connect to the guest via VNC.
Well, it IS possible to have a properly working mouse pointer in VNC 
without qemu eating up a lot of CPU cycles.
Do NOT add "usbdevice = [ 'tablet' ]" to your config, as often suggested.

Open a qmp monitor port to QEMU by adding a line similiar to the 
following to the xl.cfg file of your HVM:
device_model_args = [ "-qmp" , "tcp:127.0.0.1:4444,server,nowait" ]

Then add the tablet driver dynamically by sending the following qmp command:

echo "device_add driver=usb-tablet" | qmp-shell localhost:4444

--
Manfred Härtel, DB3HM    mailto:Manfred.Haertel@xxxxxxxxxxxx
                         http://rz-home.de/mhaertel

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