On Tue, Dec 06, 2011 at 04:33:43PM -0700, Eric Blake wrote:
[redirecting to the fedora virt list]
On 12/06/2011 03:36 PM, Dennis Jacobfeuerborn wrote:
Hi, I noticed that when you install a virtual system with virt-manager it always installs a tablet device by default. The problem is that this device consumes 10% of cpu resources of the host according to "top" which should probably be considered a bug.
The poor behavior of a tablet device should be raised against the qemu team, to see if it can be made more efficient.
This is a long standing problem, but it shouldn't be taking anywhree near 10% of CPU.
If using SPICE with the SPICE guest agent installed there is a parvirt mouse available, avoiding the need for the USB tablet.
What is worse is that removing the tablet also means no mouse pointer showing up in a centos 6 guest which means you are pretty much forced to use the tablet device.
That shouldn't be the case. If you boot the guest with no USB tablet present, X should auto-detect the PS2 mouse and use that. You would only have trouble if either hot-unpluging the USB tablet, or if you have hardcoded its use in /etc/X11/xorg.conf
Meanwhile, sufficiently new qemu provides USB device emulation, which is more efficient than the PCI tablet emulation;
Actually the tablet is a USB device, not a PCI device.
Daniel