RadeonSI Performance Patch Sharply Improves Frame-Rates
Written by Michael Larabel in AMD on 23 December 2013 at 12:56 PM EST. 40 Comments
AMD
A new patch by Marek Olšák can boost the performance of modern AMD Radeon HD 7000+ series graphics cards on the open-source "RadeonSI" driver by multiple times.

Marek published a patch this weekend on the DRI development list for the Radeon DRM Driver that fixes the render back-end setup for the Southern Islands and Sea Islands graphics processors (Radeon HD 7000 series and newer).

It turns out the open-source AMD Radeon graphics driver on kernels up through Linux 3.13 only enables the render back-ends for the first shader engine and disables the rest by accident. With Marek's correction with the new patch that changes less than a dozen lines of code, the other render back-ends are enabled and it sharply improves the performance.

In one of the sample results shown by Marek, this small patch goes from having Unigine Sanctuary running at 15 FPS on the modern RadeonSI stack to now running at 90 FPS! Fan noise will be up though now since the Southern/Sea Islands graphics cards can now reach full load.

More details on this new patch that will hopefully be merged for the Linux 3.14 kernel can be found on the dri-devel list.
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Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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