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Date: Mon, 8 Sep 2008 02:21:55 +0200
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Subject: Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window
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To: qemu-devel@nongnu.org
Cc: Paul Brook <paul@codesourcery.com>

Anthony Liguori, le Sun 07 Sep 2008 19:08:30 -0500, a =E9crit :
> Samuel Thibault wrote:
> >Paul Brook, le Sun 07 Sep 2008 16:35:54 +0100, a =E9crit :
> >>It also depends what testcase you're benchmarking. A few pixels chang=
ing=20
> >>every frame is IMHO not a particularly interesting case.
> >
> >But we shouldn't spend time on it.  For qemu it's trivial to get the
> >dirtyness of course. For Xen/KVM it's far less.
>=20
> It's actually pretty simple with KVM.

Well, you still have to ask the kernel for the dirty pages
(qemu_kvm_get_dirty_pages). Much less simple and efficient than just
reading from qemu's dirty array.

> FWIW, I don't see guests consume a tremendous amount of CPU when idle=20
> with KVM.  Can ya'll post some numbers with OpenGL and QEMU that show=20
> reduced CPU consumption?

I wasn't arguing for OpenGL, but for DGA (and thus have no numbers since
it doesn't work any more).

Samuel