----- Original Message ----- > From: "Eric Blake" <[email protected]> > To: "For testing and quality assurance of Fedora releases" > <[email protected]> > Cc: [email protected] > Sent: Tuesday, December 6, 2011 6:33:43 PM > Subject: Re: [fedora-virt] kvm "tablet" device burning cpu cycles > > [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. > > > 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. > > Meanwhile, sufficiently new qemu provides USB device emulation, which > is > more efficient than the PCI tablet emulation; although it is not as > apparent whether typical guests support that device driver in their > default install (one of the reasons we default to the older tablet > emulation is that it is likely to have a driver pre-installed on most > guest OSs). The idea of swapping the default to a USB pointer should > be > raised against virt-manager and/or python-virtinst, when installing a > new-enough guest OS with new enough qemu support, while continuing to > provide the compatible fallback of the tablet for older setups.
Also we've found Spice more efficient in our testing. > > -- > Eric Blake [email protected] +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > > > _______________________________________________ > virt mailing list > [email protected] > https://admin.fedoraproject.org/mailman/listinfo/virt _______________________________________________ virt mailing list [email protected] https://admin.fedoraproject.org/mailman/listinfo/virt
