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Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option |
Date: |
Thu, 15 Jan 2009 16:23:47 +0000 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Rene Rebe wrote:
> >I think the Linux "vesafb" driver uses all available VRAM for
> >scrolling in draws-text-on-graphic-framebuffer mode.
>
> But only with ypan enabled, which wasn't the default when I took a
> look the last time.
That's right.
I don't know why "ypan" is off by default; it's hard to imagine it not
working on anything vaguely VBE-like, or even VESA (pre-VBE), since a
lot of DOS games need the panning feature to work for double/triple
buffering.
If you're using Linux guest with VESA framebuffer console, rather than
a text-mode console, I'd recommend kernel boot option "video=vesafb:ypan",
to save considerable CPU when scrolling the console.
I don't know if "video=vesafb:ywrap" works on the QEMU VBE emulation.
That'd be better.
-- Jamie
> -- René Rebe - ExactCODE GmbH - Europe, Germany, Berlin
> http://exactcode.de | http://t2-project.org | http://rene.rebe.name
Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Trolle Selander, 2009/01/12
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Paul Brook, 2009/01/14
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Trolle Selander, 2009/01/14
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Paul Brook, 2009/01/14
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Trolle Selander, 2009/01/14
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Jamie Lokier, 2009/01/15
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Rene Rebe, 2009/01/15
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option,
Jamie Lokier <=
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Gerd Hoffmann, 2009/01/15
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Jamie Lokier, 2009/01/15
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option, Gerd Hoffmann, 2009/01/15