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

X/Wayland Is Coming Along Nicely, But Work Is Left

Wayland

Published on 04 April 2012 07:12 PM EDT
Written by Michael Larabel in Wayland
21 Comments

Keith Packard spoke on Wednesday of the 2012 Linux Foundation Collaboration concerning Wayland and its backwards compatibility support for X applications.

Here's my notes from Keith's talk concerning X/Wayland. Nothing from the presentation was particularly new or surprising, but largely summarized information from past mailing list discussions (covered in earlier Phoronix Wayland articles) and past conferences like X@FOSDEM 2012.

- As talked about in previous Phoronix articles, running X applications on Wayland should actually yield performance improvements than X running on the bare graphics card. There should be a net reduction in the number of context switches when running through X/Wayland and as a result better power consumption too.

- While X/Wayland is coming along well, still to be written is a Wayland-specific X window manager as an external application. This will be responsible for translating between ICCCM/EWMH and Wayland and provide the client-side decorations.

- The Wayland changes inside the X Server include around 50 patches to automatically redirect top-level windows, disable input device detection, and to create virtual keyboard/mouse devices with those input devices being sent commands from Wayland's input interpretation.

- The X video driver changes (xf86-video-* driver) changes include disabling native mode-setting, getting mode information from Wayland, ugly hacks for window resize/move (replaced by the yet-to-be-written X/Wayland window manager), and to not acquire the DRM master. At the moment, the xf86-video-intel driver branch is available with this X/Wayland support, but the other popular drivers still need to be updated (Nouveau and Radeon, in particular) with these less-invasive changes.

- Wayland cut-and-paste / drag-and-drop is in good shape with MIME-labeled objects and client-to-client direct transfers.

- When an X application needs to run under Wayland, the Weston compositor will be listening on the X socket, waiting for an incoming X connection, then launch the X Server while passing clients and listen file descriptors. When the X application is done, the xorg-server will be shutdown and Weston will go back waiting for new X connections. Keith would rather have systemd do this work, but Lennart said systemd currently can't start X, so they're using this small hack instead.

- For Wayland proxy support, there's plans for a Wayland proxy that can take the images (buffers) from the local client, pack the data (potentially with compression), and deliver it. This proxy could talk directly to the Wayland server or to another Wayland proxy server. This yet-to-be-written feature could potentially provide acceleration with local GPUs, eliminate most round-trips compared to a proxied X, and use lossy compression. While this has been a debated topic about networked Wayland support, Keith believes this yet-to-come support could provide for better remote application performance with Wayland than X today and is "plausible and pretty usable."

- Remaining Wayland issues including Wayland input support still being in flux (keyboard support, touch-screens, touch-pads, etc), remote Wayland application support, and bringing the X Input 2.2 enhancements to Wayland.

- As someone asked... Wayland will not do any audio support. "Go talk to PulseAudio!" (Reminds me of the earlier X Audio proposal.)

I also recorded an iPhone video of Keith's hour-long video presentation, which will be uploaded later this week and then noted in a later Phoronix article. Now go see what Rebecca Black has to do with Wayland.

While not covered during this presentation, I also learned that a base GNOME Shell 3.x desktop is now running under Wayland by the Intel OTC developers out of London (shared yesterday) who had previously brought up Tizen's Dawati under Wayland. Additionally, there's unofficial talk of NVIDIA looking towards Wayland support for their Tegra SoCs (this morning), which means the NVIDIA Tegra 3 Linux driver having a proper DRM/KMS implementation.

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. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  2. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  3. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  4. AMD Radeon R9 285 Tonga Performance On Linux
Latest Linux Articles
  1. Ubuntu 14.10 XMir System Compositor Benchmarks
  2. Btrfs RAID HDD Testing On Ubuntu Linux 14.10
  3. Ubuntu 14.10 Linux 32-bit vs. 64-bit Performance
  4. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
Latest Linux News
  1. Open-Source, Linux Support For Corsair Link Devices Slowly Materializing
  2. Cairo-Dock 3.4 Shows A Lot Of Progress, Works Toward EGL/Wayland Support
  3. Mesa 10.4 Tentatively Planned For Early December
  4. SteamOS Update 145 Brings Compositor, Update Fixes
  5. GStreamer 2014 Conference Videos Posted: Wayland, HTML5, 3D
  6. Nouveau Now Supports DRI3 Without GLAMOR
  7. Features Of The Linux 3.18 Kernel
  8. Debian Now Defaults To Xfce On Non-x86 Desktops
  9. Phoenix Is Trying To Be An Open Version Of Apple's Swift
  10. Linux 3.19 To Have Skylake Graphics, PPGTT Enablement
Latest Forum Discussions
  1. HOPE: The Ease Of Python With The Speed Of C++
  2. Users/Developers Threatening Fork Of Debian GNU/Linux
  3. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  4. AMD Releases UVD Video Decode Support For R600 GPUs
  5. Proof that strlcpy is un-needed
  6. xbox one tv tuner
  7. Bye bye BSD, Hello Linux: A Sys Admin's Story
  8. Updated and Optimized Ubuntu Free Graphics Drivers