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RE: [Xen-devel] qemu-dm cpu utilization

To: "George Dunlap " <dunlapg@xxxxxxxxx>, "McAfee, Tommie M" <Tommie.McAfee@xxxxxxxxxx>
Subject: RE: [Xen-devel] qemu-dm cpu utilization
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Mon, 28 Aug 2006 18:58:51 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, "Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>
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Thread-topic: [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.


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