On Fri, Apr 11, 2014 at 11:09:03AM +0200, Daniel Vetter wrote: > Afaik the memory controller has always done the swizzling. What this pile > of bits controls is the _additional_ swizzling done to improve the access > pattern for 2d data, i.e. everything X and Y tiled. The theory of > operation is that the additional swizzling improves access patterns when > walking in Y direction on a surface. > > And when we've last looked at this (well Chris) it seemed to indeed have > improved sampler performace.
And recall this was around SNB time. Jesse keeps claiming that IVB+ doesn't benefit, and I'm inclined to believe him. At some point, we should test again. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
