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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