On 12/07/2011 10:20 AM, Daniel P. Berrange wrote: > 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. I did some more testing today and also installed a Fedora 16 VM. Here I don't see the big overhead and an idle guest is also idle on the host so it seems this is an issue with the driver on the guest side. While I tried SPICE I didn't play with the guest agent yet. When using SPICE I switch the display device from VNC to SPICE and let virt-manager add an additional channel device (it asks me if it should do so). Is it sufficient to install spice-vdagent in the guest to make use of the client mouse mode? >> >>> 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 I experimented a bit and I only see this: 1) when I use "qxl" as video model 2) when I keep the graphical console open in virt-manager after booting When I close the window and reopen it again the mouse pointer is there and when I use "cirrus" as model the problem doesn't happen at all. Regards, Dennis -- test mailing list test@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
