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

Mesa: Fixed Function Programs Generating GLSL

Mesa

Published on 07 October 2011 06:59 AM EDT
Written by Michael Larabel in Mesa
2 Comments

Last month at XDC2011 Chicago the long-standing goal of killing off Mesa IR was talked about by Intel. There's already been the GLSL-To-TGSI translator (and also competing with that is LunarGLASS to replace Mesa IR with LLVM IR), and now there's some new work to talk about in this area that works towards the common goal.

Eric Anholt has published patches that convert the fixed function fragment program generator for Mesa to output GLSL IR. This is advancing towards the goal of having the drivers accept GLSL IR for code generation and now pushes fixed function fragment programs through the GLSL IR optimization pass. This affects hundreds of lines of code and is expected to provide an improvement for real applications. Here is Anholt's message:
Here's this patch series again, part of the kill-Mesa-IR goal we have for next release. It's been no regressions for me for a while, I was just trying to track down a 2% performance regression on gen6. It turns out that on my gen4 system, it's no performance regression, and on gen7 (at least according to testing with the followon patches to use the new coegen), it's a ~4% performance win.

While many things were learned in the process, the cause of the 2% loss appears to come down to some GPU instruction pipelining issue with lots of handwaving on my part. When using the new backend, we generate like 1/3 fewer instructions (after accounting for the 8/16 compile).

I'm not including the patches for using the new backend quite yet, as there's a functional regression on gm45 in the new backend that I need to track down first.


Mesa 7.12/8.0 is shaping up to be one hell of a release, particularly if OpenGL 3.0 support is achieved.

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. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  2. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  3. AMD Radeon R9 285 Tonga Performance On Linux
  4. Apotop Wi-Copy
Latest Linux Articles
  1. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
  2. MSI: Update Your BIOS From The Linux Desktop
  3. NVIDIA vs. AMD 2D Linux Drivers: Catalyst Is Getting Quite Good At 2D
  4. 15-Way GPU Comparison With Mesa 10.3 + Linux 3.17
Latest Linux News
  1. Phoronix Test Suite 5.4 M3 Is Another Hearty Update
  2. GParted 0.20 Improves Btrfs Support
  3. EXT4 In Linux 3.18 Has Clean-ups, Bug Fixes
  4. Emacs 24.4 Has Built-In Web Browser, Improved Multi-Monitor Support
  5. NVIDIA's NVPTX Support For GCC Is Close To Being Merged
  6. KDE's KWin On Wayland Begins Using Libinput
  7. Khronos Releases OpenVX 1.0 Specification
  8. Linux Kernel Working Towards GNU11/C11 Compatibility
  9. Ubuntu 15.04 Is Codenamed After A Monkey: Vivid Vervet
  10. Following GCC, Clang Looks To Default To C11
Latest Forum Discussions
  1. HOPE: The Ease Of Python With The Speed Of C++
  2. Users/Developers Threatening Fork Of Debian GNU/Linux
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. Bye bye BSD, Hello Linux: A Sys Admin's Story
  5. NVIDIA Presents Its Driver Plans To Support Mir/Wayland & KMS On Linux
  6. AMD Is Restructuring Again, Losing 7% Of Employees
  7. Open-Source AMD Fusion E-350 Support Takes A Dive
  8. Upgrade to Kaveri, very slow VDPAU performance