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List: freedesktop-xorg
Subject: Re: 945GM(E) screen rotation and slow GL.
From: Rob Kramer <robk () starhub ! net ! sg>
Date: 2009-01-14 7:16:54
Message-ID: gkk3h6$7bs$1 () ger ! gmane ! org
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Keith Packard wrote:
>> Do you think the 945 chipset is just too slow to rotate a 1920x1200
>> screen?
>
> One thing that may improve performance a bit is when we get tiling
> support for the displayed buffer. That work requires some additional
> kernel infrastructure to manage the 'fence' registers which are
> responsible for linearizing tiled regions for software rendering code.
>
> You might try 16bpp instead of 32bpp; it won't look as good, but it
> should go faster.
Tried that: 85 fps in normal mode, 27 fps for left-rotation.
Would a board with a 965GM chipset fare much better, you think? I haven't
seen many small form-factor embedded boards with that chipset yet,
unfortunately.
Cheers,
Rob
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