Tiling on i915-class hardware

[Vasily Khoruzhick]

Hi, I've just tested i915 tiling in 2 ram configurations:

512mb, single channel: tiling works perfectly, no performance issues with 
tiling enabled
512mb + 512mb dual channel interleaved: When tiling is enabled it introduces 
performance regression, when I enable tiling 3D performance is low. With 
tiling disabled I hit this bug: 
http://bugs.freedesktop.org/show_bug.cgi?id=19738 

So, the problem exists at least for configurations with 2 memory modules in 
dual channel interleaved mode, and it doesn't exist in single channel mode.

I can provide any additional info if you need.

Regards
Vasily
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