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 Articles & Reviews
  1. AMD FX-8320E Performance On Linux
  2. Linux Compiler Benchmarks Of LLVM Clang 3.5 vs. LLVM Clang 3.6-rc1
  3. Intel Broadwell HD Graphics 5500: Windows 8.1 vs. Linux
  4. Linux Benchmarks Of NVIDIA's Early 2015 GeForce Line-Up
  5. NVIDIA GeForce GTX 960: A Great $200 GPU For Linux Gamers
  6. Disk Encryption Tests On Fedora 21
Latest Linux News
  1. Compare Your Linux System To The i7-5600U Broadwell X1 Carbon ThinkPad
  2. Debian 8.0 "Jessie" Installer RC1 Released
  3. Chromebook "Rush" With 64-bit Tegra SoC Support Lands In Coreboot
  4. 2015 X.Org Elections Get Underway For Board Members, SPI Merger
  5. Linux 3.19-rc6 Kernel Released: LInux 3.19 Final In Two Weeks
  6. Ubuntu's Mir Gains Server-Side Platform Probing
  7. Broadwell Linux Ultrabook Running MUCH Cooler Than Haswell
  8. LZHAM 1.0 Lossless Data Compression Codec Released
  9. LibreOffice 4.4 Is Coming Soon With New Features
  10. Linux Users Upset By Chromium's Busted HiDPI Support
Most Viewed News This Week
  1. Windows 10 To Be A Free Upgrade: What Linux Users Need To Know
  2. Google Admin Encourages Trying Btrfs, Not ZFS On Linux
  3. TraceFS: The Newest Linux File-System
  4. My Initial Intel Broadwell Linux Experience With The ThinkPad X1 Carbon
  5. Mozilla's Servo Still On Track For 2015 Alpha Release
  6. Fedora 23 Likely To Pursue Wayland By Default
  7. Keith Packard Leaves Intel's Linux Graphics Work
  8. Interstellar Marines On Linux With Catalyst: Bull S*#@