Radeon TONGA Sees Some Gains With AMDGPU DRM-Next 4.12

Over the past few days I have posted some RX 480 tests and R9 Fury OpenGL/Vulkan tests for the new AMDGPU code slated for Linux 4.12. I've also carried out some R9 285 "Tonga" tests and happy to report seeing some performance gains there too...