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what everyday tasks would be accelerated right now with 1D ?
how to enable it ?
1D and 2D refer to the layout of the tile pattern. 1D is fixed size 8x8 micro tiles, 2D is macro tiles composed of several micro tiles. 1D tiling helps cache locality, 2D tiling helps memory channel locality. 2D is much more complex to enable since it's tied in to the memory controller configuration on each board. You can enable it with:
Option "ColorTiling" "True"
in the device section of your xorg.conf