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

Performance Counters Stuck For Linux GPU Drivers

Free Software

Published on 02 February 2013 10:41 AM EST
Written by Michael Larabel in Free Software
6 Comments

While it mostly concerns developers, another current shortcoming of the open-source Linux graphics drivers is the lack of suitable performance counters support.

During Ian Romanick's discussion at FOSDEM about, "GPU hardware detection for automatic configuration of game quality/performance settings", Martin Peres of the Nouveau project brought up performance counters for being able to read exposed information by the hardware that helps driver developers and game developers with useful real-time hardware performance information such as about cache usage, PCI-E bandwidth utilization, and other hardware attributes.

The details about Romanick's interesting talk will be shared in a separate article, but when it comes to performance counters for open-source Linux GPU drivers it is another area where open-source drivers lag behind the proprietary graphics drivers. The open-source state comes down to:

Intel: They don't support any performance counters for their graphics hardware by the open-source driver. Intel has lots of developers to work on the support, but for now at least they're being blocked by the Intel legal department. It looks like Intel's trying to keep their graphics performance counters a closely-guarded secret since it exposes so many low-level hardware details.

The Intel GPU performance counters have been described as being extremely programmable and do allow for on-the-fly adjustments. The available counters on the graphics side are said to be similar to Intel's CPU performance counters but with even more options for developers. The problem is that it's too much and so Intel doesn't want to make it all public. Intel Open-Source Technology Center developers are pushing for portions of the performance counters infrastructure to be opened at least for the most important and commonly sought after counters.

Nouveau: Martin Peres says the reverse-engineered NVIDIA graphics driver has figured out how to read the GeForce performance counters, but they really aren't sure what the data means.

Radeon: That's unknown since no Radeon developers showed up to FOSDEM.

When the open-source graphics drivers on Linux begin to expose their hardware performance counters, the data will likely be exposed to application/game developers through an OpenGL extension like the already existing GL_AMD_performance_monitor.

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. OS X 10.10 vs. Ubuntu 15.04 vs. Fedora 21 Tests: Linux Sweeps The Board
  2. The New Place Where Linux Code Is Constantly Being Benchmarked
  3. 18-GPU NVIDIA/AMD Linux Comparison Of BioShock: Infinite
  4. Phoronix Test Suite 5.6 Adds New Phoromatic Enterprise Benchmarking Features
  5. OpenGL Threaded Optimizations Responsible For NVIDIA's Faster Performance?
  6. Big Graphics Card Comparison Of Metro Redux Games On Linux
Latest Linux News
  1. Git 2.4.0-rc0 Does A Ton Of Polishing
  2. The Most Common, Annoying Issue When Benchmarking Ubuntu On Many Systems
  3. Mesa Is At Nearly 1,500 Commits This Year
  4. Gestures & Other GTK3 Features For LibreOffice
  5. It's Now Easier To Try PHP 7 On Fedora & RHEL
  6. BQ Is Cleaning Up Their Aquaris E4.5 Ubuntu Kernel
  7. Allwinner Continues Jerking Around The Open-Source Community
  8. NVIDIA Linux 349.12 Beta Has Improved G-SYNC & VDPAU Features
  9. Canonical Just Made It Even Easier To Benchmark Ubuntu Linux In The Cloud
  10. NVIDIA GeForce GTX TITAN X Linux Testing Time
Most Viewed News This Week
  1. Introducing The Library Operating System For Linux
  2. AMD Is Hiring Two More Open-Source Linux GPU Driver Developers
  3. New SecureBoot Concerns Arise With Windows 10
  4. GNOME Shell & Mutter 3.16.0 Released
  5. GNU Nano 2.4.0 Brings Complete Undo System, Linter Support & More
  6. Systemd Change Allows For Stateless Systems With Tmpfs
  7. GCC 5 Compiler Is Getting Close To Being Released
  8. Chromebooks Powered By The MIPS Pistachio, Linux Support Evolving