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Tonga AMDGPU Performance On Ubuntu 16.04 Has 80~90%+ Performance Of Catalyst

Unigine Heaven and Tesseract are the tests where AMDGPU+RadeonSI is struggling the most relative to the AMD proprietary driver.

Unigine Valley on the open-source driver stack competes much better than in Heaven.

Xonotic with low image quality settings led to better frame-rates with Ubuntu 16.04 than Ubuntu 14.04, but as the visual intensity increased, the open-source driver stack was falling behind Ubuntu 14.04 with Catalyst.