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AMD Has A New Radeon DRM Performance Patch

AMD

Published on 02 May 2014 07:04 AM EDT
Written by Michael Larabel in AMD
7 Comments

AMD has a new Radeon DRM kernel driver patch pending that is able to offer Linux gaming performance improvements by improving the video memory bandwidth performance by the open-source graphics driver.

Published on Thursday was the latest patch by AMD's Christian K├Ânig that adds large PTE support for their most recent GPUs -- the Northern Islands (HD 6000 series) through Southern/Sea Islands (HD 7000 series and newer; GCN hardware).

Christian explained in the patch contents:
This patch implements support for VRAM page table entry compression. PTE construction is enhanced to identify physically contiguous page ranges and mark them in the PTE fragment field. L1 TLB and L2 cache support is enabled for 64KB (SI/CIK) and 256KB (NI) PTE fragments, significantly improving TLB utilization for VRAM allocations.

Linear store bandwidth is improved from 60GB/s to 125GB/s on Pitcairn. Unigine Heaven 3.0 sees an average improvement from 24.7 to 27.7 FPS on default settings at 1920x1200 resolution with vsync disabled.

This patch wasn't part of the latest Radeon DRM fixes for Linux 3.15; hopefully this performance enhancing patch will be applied for the Linux 3.16 kernel. Of course, when it is mainlined, you can surely bet that it will be benchmarked on Phoronix. In case you missed it, we posted some Radeon Linux 3.14 vs. 3.15 benchmarks yesterday.

About The Author
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 and or contacted via .
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