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

Another Shot At The KMS Page-Flipping Ioctl

Linux Kernel

Published on 12 November 2009 03:50 PM EST
Written by Michael Larabel in Linux Kernel
7 Comments

Being worked on for the past several months by Kristian Høgsberg and other developers has been the KMS page-flipping ioctl, which makes it possible for kernel mode-setting drivers to benefit from tear-free updating of the screen with low-latency page-flipping. This kernel DRM ioctl is also a requirement for the Wayland Display Server. The page-flipping ioctl should have made it into the Linux 2.6.32 kernel, but it didn't end up happening due to some last minute work.

This afternoon though Kristian has republished his kernel mode-setting page-flipping ioctl patch with the latest changes. This latest patch incorporates blocking within the kernel and optional events to user-space. Moving the blocking from user-space into the kernel allows other processes to use the GPU while waiting for the page flip at the next vblank.

This DRM ioctl patch touches about 400 lines of code (mostly the addition of new code) and is now hopefully ready to enter the Linux 2.6.33 kernel, which is great news for those using the X Server and also those wanting to experiment with Wayland but have been waiting for more of the work to land in mainline trees. The Linux 2.6.33 kernel will be the first release in 2010.

This latest page-flipping ioctl patch can be found on the DRI development list.

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. Khronos Group Announces Vulkan, OpenCL 2.1, SPIR-V
  2. Samsung 850 EVO SSD Linux Benchmarks
  3. Kubuntu 15.04 Is Turning Out Quite Nice, Good Way To Try Out The Latest KDE
  4. 5-Way Linux Distribution Comparison On The Core i3 NUC
  5. OCZ ARC 100 Linux SSD Benchmarks
  6. Lenovo ThinkPad X1 Carbon Works Great As A Linux Ultrabook
Latest Linux News
  1. A Brand New Linux Network Stack Proposed: Linux XIA
  2. Niche Drivers Get Ported To Atomic Mode-Setting For Linux 4.1
  3. openSUSE Tumbleweed Continues Ascending
  4. Open-Source SPIR-V Reader & Writer Written In Java
  5. LunarGLASS Adds Experimental SPIR-V Front-End
  6. The New Open-Source Linux Test Farm Is Almost Operational
  7. Samba 4.2 Brings Transparent File Compression & Clustering Support
  8. Mutter 3.15.91 Fixes Wayland Nested Compositor Mode, Pointer Constraining
  9. NVIDIA Opens Up CPU-Based PhysX Code
  10. SPIR-V In GCC Is Already Being Talked About
Most Viewed News This Week
  1. The Tremendous Features Of Fedora 22
  2. Confirmed: Vulkan Is The Next-Gen Graphics API
  3. Xfce 4.12 Released After Nearly Three Years Of Work
  4. 8cc: A Small C11 Compiler
  5. LLVM 3.6 & Clang 3.6 Deliver More Features, Complete C++14 Support
  6. Unreal Engine Made Free By Epic Games
  7. Canonical's Latest Demo Of Ubuntu Unity 8 Convergence In Action
  8. ALSA 1.0.29 Released