Re: [Qemu-devel] Re: Qemu 2D performance plunges below acceptable levels

[malc]

On Mon, 23 Feb 2009, Stefano Stabellini wrote:

> malc wrote:
> 
> > Let me reiterate - SDL_UpdateRect was REMOVED from sdl_update, SDL_Flip 
> > was added to _sdl_refresh_. So, no, SDL_Flip is NOT faster than
> > SDL_UpdateRect.
> > 
> 
> 
> This change also shouldn't have any effect since sdl_refresh is the one
> that calls sdl_update  in the end.
> The code path is the following:
> 
> sdl_refresh -> vga_hw_update -> vga_draw_graphic -> dpy_update -> sdl_update

That would mean that the vga_hw_update chain calls sdl_update multiple
times.

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