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

DMA-BUF Cross-Device Synchronization Hits Linux 3.17

Linux Kernel

Published on 05 August 2014 08:35 AM EDT
Written by Michael Larabel in Linux Kernel
12 Comments

The work that was ongoing for months to provide DMA-BUF cross-device synchronization and fencing is finally landing with the Linux 3.17 kernel.

The patches by Maarten Lankhorst for DMA-BUF cross-device synchronization were up to eighteen revisions and are now finally in a condition to be merged with Linux 3.17 via the driver core subsystem pull. DMA-BUF has now proper fence and poll support along with other new functionality that affects many different kernel drivers. For Phoronix readers, one of the benefits of DMA-BUF cross-device synchronization is to reduce tearing when sharing buffers between multiple GPU DRM drivers.

A fence in the context of DMA-BUF as described by Maarten is, "a fence can be attached to a buffer which is being filled or consumed by hardware, to allow userspace to pass the buffer without waiting to another device. For example, userspace can call page_flip ioctl to display the next frame of graphics after kicking the GPU but while the GPU is still rendering. The display device sharing the buffer with the GPU would attach a callback to get notified when the GPU's rendering-complete IRQ fires, to update the scan-out address of the display, without having to wake up userspace."

The new DMA-BUF code is landing in Linux 3.17 via the driver core pull request.

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. MSI X99S SLI PLUS On Linux
  2. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  3. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  4. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
Latest Linux Articles
  1. Open-Source Radeon 2D Performance Is Better With Ubuntu 14.10
  2. RunAbove: A POWER8 Compute Cloud With Offerings Up To 176 Threads
  3. 6-Way Ubuntu 14.10 Linux Desktop Benchmarks
  4. Ubuntu 14.10 XMir System Compositor Benchmarks
Latest Linux News
  1. Dead Island GOTY Now Available On Linux/SteamOS
  2. Ubuntu 14.04 In The Power8 Cloud From RunAbove
  3. KDE With Theoretical Client-Side Decorations, Windows 10 Influence
  4. Sandusky Lee: Great Cabinets For Storing All Your Computer Gear
  5. Fedora 21 Beta & Final Release Slip Further
  6. Mesa 10.3.2 Has A Couple Bug-Fixes
  7. RadeonSI/R600g HyperZ Support Gets Turned Back On
  8. openSUSE Factory & Tumbleweed Are Merging
  9. More Fedora Delays: Fedora 21 Beta Slips
  10. Mono Brings C# To The Unreal Engine 4
Latest Forum Discussions
  1. Looking for a Open-Source AMD experienced Linux mentor
  2. Users/Developers Threatening Fork Of Debian GNU/Linux
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. HOPE: The Ease Of Python With The Speed Of C++
  5. Use Ubuntu MATE 14.10 Make it an official distro.
  6. Debian Is Back To Discussing Init Systems, Freedom of Choice
  7. AMD Radeon VDPAU Video Performance With Gallium3D
  8. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release