1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Intel Mesa Driver Gets KDE KWin Optimizations

KDE

Published on 01 April 2013 08:55 PM EDT
Written by Michael Larabel in KDE
Comment On This Article

A number of commits to the i965 driver in Mesa today benefit the performance of KDE's KWin window manager for those using Intel Ivy Bridge graphics hardware.

There were a number of commits pertaining to the i965 driver's fragment shared pushed this afternoon (i965/fs). Most notably, this should help Ivy Bridge with KWin when using the scaling-related effects using the OpenGL 2.x renderer.

The bug report relevant to this Intel IVB OpenGL performance regression is covered at FreeDesktop.org. There's several commits relevant to this optimization work. One of the commits by Eric Anholt also mentions a significant performance improvement with one of his GL Shading Language demos.
Like we have done for the VS and for constant-index uniform loads, we use the sampler engine to get caching in front of the L3 to avoid tickling the IVB L3 bug. This is also a bit of a functional change, as we're now loading a vec4 instead of a single dword, though we're not taking advantage of the other 3 components of the vec4 (yet).

With the driver hacked to always take the varying-index path for all uniforms, improves performance of my old GLSL demo by 315% +/- 2% (n=4). This a major fix for some blur shaders in compositors from the varying-index uniforms support I introduced in 9.1.
It also looks like the newly-merged patch series takes care of some Sandy Bridge performance issues too.

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 .
Latest Linux Hardware Reviews
  1. Even With Re-Clocking, Nouveau Remains Behind NVIDIA's Proprietary Linux Driver
  2. The Power Consumption & Efficiency Of Open-Source GPU Drivers
  3. AMD R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  4. Intel Pentium G3258 On Linux
Latest Linux Articles
  1. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  2. KVM Benchmarks On Ubuntu 14.10
  3. X.Org Server 1.16 Officially Released With Terrific Features
  4. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air
Latest Linux News
  1. Age Of Wonders III Is Still Being Ported To Linux
  2. Git 2.1 To Further Mainline Windows Support Patches
  3. Debian 8.0 Jessie Is Settling For Linux 3.16
  4. Meson: A Next-Gen Build System Showing Promise
  5. Linux 3.16-rc7 Calms Things Down For The Linux 3.16 Kernel
  6. Open-Source AMD Users Report Hawaii GPU Acceleration Is Working
  7. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  8. Cauldron 2014: GCC & LLVM Will Look To Collaborate More
  9. GCC Receives ACM Programming Languages Software Award
  10. KDE 4.14 Beta 3 Released
Latest Forum Discussions
  1. Porting Mesa to the Playstation 2
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. ASRock AM1H-ITX: One Of The Best AM1 Mini-ITX Motherboards
  4. Debian + radeonsi
  5. Open-source drivers on ATI R7 260X
  6. Table test
  7. How To Setup Radeon DPM On Ubuntu Linux
  8. New build, first Linux PC, what could go wrong? ;)