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AMD Tonga & Fiji Open-Source Performance Boosted By PowerPlay Patches

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Yesterday AMD finally posted power management support for the AMDGPU DRM kernel driver when it comes to supported discrete graphics cards like Tonga and Fiji. I've been testing these PowerPlay Linux patches since yesterday to great success. In this article are results from a Radeon R9 285 and Radeon R9 Fury when testing these kernel patches along with the latest Mesa 11.1-devel Git drivers.

These AMDGPU PowerPlay patches are working out well so far in my tests. See the two aforementioned articles for more details on this AMDGPU power management code that lands more than 45000 lines of new code into this Direct Rendering Manager driver for the latest AMD graphics processors. It's just a pity that the code is too late for making it into the Linux 4.4 kernel merge window and thus won't be mainlined for a few months until the Linux 4.5 kernel. Up to now, the newer AMD graphics cards on the open-source AMD Linux driver have been limited to whatever (low) frequencies the core and memory clocks are initialized to at boot time. With PowerPlay, they can finally (and dynamically) ramp up when to their rated specifications.

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