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 Benchmarking Platform
Phoromatic Test Orchestration

Lack Of Broadwell RC6 Has Us Looking Toward Linux 3.15

Intel

Published on 29 January 2014 03:36 AM EST
Written by Michael Larabel in Intel
1 Comment

While Intel's upcoming Broadwell processors will have proper graphics driver support with the Linux 3.14 kernel (and updated user-space components), for those concerned about power usage, there's still some very important bits that do not look like they will land until at least the Linux 3.15 kernel.

Ben Widawsky of Intel sent out a patch series on Tuesday evening for implementing RC6 and RPS on Broadwell to increase power-savings. Broadwell should be in good shape for Linux 3.14, but it won't have the RC6 power savings mode to lower the integrated graphics processor's power use even more when under idle. RC6 has been present for several generations of Intel hardware and has caused big power wins when properly implemented within Intel's DRM driver.

Ben wrote, "This patch series implements RC6 and RPS for Broadwell. Most of the work had already been done with the initial merge of Broadwell support, however, there were a couple of missed things, and enough stuff had moved around. The big change is the addition of the interrupt handlers. I am mostly interested in getting RC6 working. RC6 enabling is critical to getting other teams up and running. I decided to table RPS as well because the code isn't quite as isolated as I would like, and the work didn't seem that difficult."

In Ben's final mailing list patch he noted, "It is tested and looking fairly stable now, so turn it on." There's a fair amount of changes and code refactoring that went on to make RC6 work for Broadwell. While the Linux 3.14 kernel merge window is still open, these patches haven't even been queued up for the intel-drm-next branch and are unlikely to be merged until the Linux 3.15 kernel.

Intel Broadwell processors should be out within a few months time and I'm incredibly excited to test them on Linux. Broadwell is the 14nm shrink of Haswell and its graphics abilities should be amazing along with many improvements on the general CPU front as well.

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. Radeon Linux Benchmarks: Catalyst 15.3 Beta vs. Linux 4.0 + Mesa 10.6-devel
  2. Trying Out The Modern Linux Desktops With 4 Monitors + AMD/NVIDIA Graphics
  3. Turning A Basement Into A Big Linux Server Room
  4. NVIDIA's $1000+ GeForce GTX TITAN X Delivers Maximum Linux Performance
  5. OS X 10.10 vs. Ubuntu 15.04 vs. Fedora 21 Tests: Linux Sweeps The Board
  6. The New Place Where Linux Code Is Constantly Being Benchmarked
Latest Linux News
  1. Kodi 15 Alpha 2 Released
  2. VirtualBox 5.0 Now In Beta, Adds PV To Windows/Linux Guests
  3. Go Language Improvements Coming For Ubuntu 15.04
  4. The Big SuperTuxKart Update Is Almost Ready
  5. Blender 2.74 Brings Many Improvements
  6. Qt Creator 3.4 Is Near
  7. Allwinner: "We Are Taking Initiative Actions Internally"
  8. It's Been Five Years Since The Phoronix Visit To Chernobyl
  9. Vulkan, The New Linux Server Room & BioShock Won Linux Users In March
  10. Debian 8.0 Jessie Gets A Release Date
Most Viewed News This Week
  1. Systemd Developers Did NOT Fork The Linux Kernel
  2. The Big Features Of The Linux 4.0 Kernel
  3. Improved OpenCL Support For Blender's Cycles Renderer
  4. Open-Source Driver Fans Will Love NVIDIA's New OpenGL Demo
  5. Ubuntu 15.04 Final Beta Released
  6. Nuclide: Facebook's New Unified IDE
  7. Debian 8.0 Jessie RC2 Installer Released
  8. The Most Common, Annoying Issue When Benchmarking Ubuntu On Many Systems