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. The MSI X99S SLI PLUS Is Working & Running Well On Linux
  2. NVIDIA GeForce GTX 980: The Best GPU For Linux Gamers
  3. ROCCAT LUA: A Linux-Friendly Gaming Mouse
  4. Cheetah Mounts: The Affordable Way To Put Your TV On The Wall
Latest Linux Articles
  1. Preview: Radeon Gallium3D Performance For CS:GO On Linux
  2. XWayland Linux Gaming Performance With GNOME Wayland On Fedora 21
  3. EXT4/Btrfs/XFS/F2FS Benchmarks On Linux 3.17
  4. Fedora 21 Alpha First Impressions: It's Great
Latest Linux News
  1. CUPS Turn 15 Years Old, CUPS 2.0 Released
  2. VA-API Gallium3D State Tracker Added Back To Mesa
  3. Radeon DRM Gets New Information Ioctl Queries
  4. Mir 0.8 Works On Less ABI Breakage, Touchspots, Responsiveness
  5. CS:GO For Linux Gains Better Stability, Community Server Support
  6. NVIDIA Issues Updated 340.46 Long-Lived Driver Release
  7. KDE Plasma 5.1 Now In Beta
  8. Systemd & Debian Were Most Popular In September
  9. Microsoft Announces... Windows 10 With A Start Menu
  10. Borderlands 2 Launches On Steam For Linux
Latest Forum Discussions
  1. Take the Steam Survey results with a grain of salt. It is flawed.
  2. X.Org Is Looking For Some Female Help
  3. Hacking Express gate (Asus Splashtop)
  4. Microsoft Announces... Windows 10 With A Start Menu
  5. NVIDIA Alerts Nouveau: They're Starting To Sign/Validate GPU Firmware Images
  6. Updated and Optimized Ubuntu Free Graphics Drivers
  7. Nero CD/DVD Burning Software On Linux Is Dead
  8. New Group Calls For Boycotting Systemd