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Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window |
Date: |
Sun, 7 Sep 2008 16:35:54 +0100 |
User-agent: |
KMail/1.9.9 |
> > > Which part(s) of the framebuffer?
> >
> > Whichever parts have changed.
>
> Sure, how do you detect that?
> The previous Xen memcmp method was eating 10% cpu for a 30Hz refresh,
> just for the memcmp. Now it uses the pagetable dirty bits and after
> some idleness, trapping, but having the guest just write to actual
> video memory (when it _has_ to be shown on the screen anyway) seems the
> fastest way.
Page granularity dirtyness is trivial. In fact qemu already does this. I'd be
surprised if finer granularity gave any real benefit.
It also depends what testcase you're benchmarking. A few pixels changing every
frame is IMHO not a particularly interesting case. The only time this really
happens is mouse movement, and there are better ways of fixing that (proper
hardware mouse cursors). The interesting cases are guest completely idle, and
large screen updates.
Paul
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, (continued)
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Stefano Stabellini, 2008/09/04
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Jamie Lokier, 2008/09/05
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/05
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Jamie Lokier, 2008/09/06
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Paul Brook, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Paul Brook, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window,
Paul Brook <=
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Paul Brook, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Anthony Liguori, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Jamie Lokier, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Stefano Stabellini, 2008/09/08
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Jamie Lokier, 2008/09/08
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Stefano Stabellini, 2008/09/05
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Daniel P. Berrange, 2008/09/05
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Stefano Stabellini, 2008/09/05