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xen-devel
RE: [Xen-devel] qemu-dm cpu utilization
> Another pertinent question is, what size screen are you using?
>
> From what I've heard, rather than trap on every MMIO
> instruction, HVM guests are given direct access to the
> virtual framebuffer. But this means that QEMU needs to scan
> the framebuffer on a regular basis to find changes, and then
> do diffs to make appropriate VNC changes. This probably
> scales linearly with the number of pixels to be scanned.
>
> Try using a lower resolution, and see what you get.
1024x768 is the 'recommended'. I don't think the emulated Cirrus card
had enough video memory to do full-colour in higher resoloutions.
Ian
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