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

A GEM-ified TTM Manager For Radeon

X.Org

Published on 26 August 2008 08:15 AM EDT
Written by Michael Larabel in X.Org
19 Comments

Back in May when X.Org developers were voicing concerns about Tungsten's TTM as being the kernel memory manager used for graphics drivers, Keith Packard had unveiled the work Intel had been doing for an alternate kernel memory manager. This memory manager they call GEM, or the Graphics Execution Manager, is a competing solution but it has some advantages such as being simpler to develop drivers around (A Technical Explanation of Intel's GEM). Intel then continued in throwing out their TTM code and merging GEM to master.

This unexpected introduction of GEM has caused the other driver developers to rethink their memory management situation and it has also generated some additional headaches within the X.Org community. For instance, a new X acceleration architecture has been introduced (albeit based off the EXA API) but with hooks for GEM. In addition, the forthcoming release of X Server 1.5 / X.Org 7.4 has lost DRI2 support since it depended upon the TTM interface.

Red Hat's David Airlie, who mostly works on the xf86-video-ati driver, has a brief update on some of the work he has been doing with GEM. In the DRI development mailing list, Airlie shares that he has removed all the TTM interfaces and ioctls from the kernel API, a DRM hardware lock file, object zeroing for the video memory, and has built a Radeon GEM interface that resides on top of the TTM internals. Some developers have voiced concerns about GEM being designed with just Intel in mind, but now David has an interface that's compliant with the GEM, but at it's heart is still TTM. This work can be found in his modesetting-gem git branch.

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. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  2. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  3. OCZ Vector 150 SSD On Linux
  4. Noctua i4 CPU Cooler: Great For Cooling High-End LGA-2011v3 CPUs
Latest Linux Articles
  1. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  2. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  3. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
  4. 6-Way Winter 2014 Linux Distribution Comparison
Latest Linux News
  1. Linux 3.19-rc1 Kernel Released Ahead Of Schedule
  2. Civilization: Beyond Earth Linux GPU/Driver Benchmarks
  3. X.Org Server 1.16.3 Released To Fix Security Issues
  4. Linux 3.19 Merge Window Closes Ahead Of Schedule
  5. MIPS R6 Architecture Now Supported By GCC
  6. LowRISC To Feature Tagged Memory & Minion Cores
  7. Intel Skylake Audio Support For Linux 3.19
  8. After 10+ Years, NetworkManager Reaches v1.0
  9. VDPAU Updated To v0.9
  10. An Open Hardware Random Number Generator Proposed
Latest Forum Discussions
  1. FPS capped on Linux (AMD fglrx drivers)
  2. Need some hand holding with upgrading xserver
  3. Are there an app using HSA ?
  4. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems
  5. XLennart: A Game For Systemd Haters With Nothing Better To Do
  6. Updated and Optimized Ubuntu Free Graphics Drivers
  7. Debian init discussion in Phoenix Wright format
  8. Bench specific mount point