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The ATI R600/700 DDX & Mesa Now Have Tiling In Place
The tiling support on the 3D side landed in the classic Mesa R600 driver over a number of commits with this commit providing a bulk of the needed 1D/2D tiling work. The commit for taking advantage of tiling in the ATI X.Org driver can be found here, but 1D (micro) tiling is currently the default where as 2D tiling is supposed to be more beneficial.
Of course, in order to take advantage of this Mesa and DDX tiling support for the ATI Radeon HD 2000/3000/4000 series graphics cards you will need to be using the Linux 2.6.36 kernel or a kernel that has the back-ported Radeon DRM code. The Radeon DRM code in the 2.6.36 kernel also has R300/500 Hyper-Z support, R600 thermal sensor readings, amd other new features.