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Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option |
Date: |
Thu, 15 Jan 2009 18:36:12 +0100 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20090105) |
Jamie Lokier wrote:
> I don't know why "ypan" is off by default;
Performance. When reaching the end of video memory ypan does a memcpy
on the framebuffer. ywrap doesn't need the memcpy, but doesn't work on
all hardware. The memcpy is painful slow because framebuffer *read*
access isn't something gfx cards are optimized for.
> 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.
Should work inside qemu because you should not face the slow-reads issue
then. On real hardware it very likely makes scrolling noticeable slower.
cheers,
Gerd
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option - revised, (continued)
- 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, 2009/01/15
- Re: [Qemu-devel] [PATCH] [RFC] Variable video ram size option,
Gerd Hoffmann <=
- 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