intel driver gets slow as soon as I rotate on a 1920x1200 display

Lukas Hejtmanek xhejtman at
Thu Jul 26 13:43:41 PDT 2007


On Mon, Jul 23, 2007 at 08:54:54AM -0700, Jesse Barnes wrote:
> > I just commited a typo fix for this, but I haven't a 915/945 mobile by hand
> > to test with fbc enabled. Could you test with latest git?
> Thanks Zhenyu, I did a quick scan last Thu. and didn't see anything, this 
> should help.
> And currently, on 965, I've marked tiling as unsupported, which means 
> framebuffer compression isn't enabled by default.  You can still force it on 
> using "Tiling" "true" and "FramebufferCompression" "true", but there are 
> known rendering bugs; hopefully I can fix those soon.

I just found that the new memory allocation code forces either all buffers to
be tiled or none buffer is tiled. The previous version tiled at least back and
depth buffers. 

Now, if I use tiling, I got glxgears at 990FPS and ppracer at 33FPS. If none
buffer is tiled then I got glxgears at 200FPS and ppracer at 3.6FPS. 

So, I guess this is the issue with slow down.

Lukáš Hejtmánek

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