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

An Update On The Linux Power Situation In Ubuntu

Michael Larabel

Published on 7 October 2011
Written by Michael Larabel
Page 3 of 6 - 13 Comments

This first set of results is again looking at the vanilla Linux kernels (2.6.36, 2.6.37, 2.6.38, 3.0, 3.0.1, and 3.1 Git) plus when applying the "pcie_aspm=force" option on the current near-final Linux 3.1-rc9+ kernel. The system was from a Lenovo ThinkPad W510 with an Intel Core i7 Q 720 with 4GB of RAM, 160GB Intel SSD, and NVIDIA Quadro FX 880M graphics.

This Intel Core i7 CPU does not support the energy performance bias (EPB) feature and its BIOS also doesn't expose ASPM support, but does work fine and does require it being forced in post-2.6.37 kernels. Now for these results from the prominent mainline Linux kernel releases. This first test is of the battery-power-usage test profile that looks at the power consumption while idling, then while idling with the display turned off, and then the display re-enabled and a brief video clip is played through MPlayer.

Even with the vanilla Linux 3.0.1 and 3.1 Git kernels, the power usage is still significantly higher than in pre-2.6.38 releases. From Linux 2.6.37 to 3.1 Git, the power consumption for the ThinkPad is up by 30%. Only when forcibly enabling ASPM does the power consumption on the modern kernel releases drop nearly to a level where it was in 2.6.36 and 2.6.37. When moving from 3.0 to 3.0.1 or 3.1 Git, which has the "x86, intel, power: Initialize MSR_IA32_ENERGY_PERF_BIAS" commit, there was no real change in power consumption since this hardware doesn't support the MSR in question.

The OpenArena story is much the same as the battery-power-usage results.

At least the Nouveau DRM driver is faster on the newer kernels, but that's already been looked at in numerous other Phoronix articles.

Latest Articles & Reviews
  1. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  2. The Lenovo T450s Is Working Beautifully With Linux
  3. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
  4. Linux 4.0 Hard Drive Comparison With Six File-Systems
  5. Lenovo ThinkPad T450s Broadwell Preview
  6. How Open-Source Allowed Valve To Implement VULKAN Much Faster On The Source 2 Engine
Latest Linux News
  1. GCC 5.1 RC2 Arrives, GCC 5.1 Planned For Next Week
  2. F2FS For Linux 4.1 Has New Features & Fixes
  3. Phoronix Server Upgrade This Weekend: Dual Haswell Xeons, 96GB DDR4
  4. Google's Experimental QUIC Transport Protocol Is Showing Promise
  5. Red Hat Joins Khronos, The Group Behind OpenGL & Vulkan
  6. NetworkManager Drops WiMAX Support
  7. Wine 1.7.41 Works More On Kernel Job Objects, MSI Patches
  8. Linux 4.1 Has Improvements For The Multi-Queue Block Layer
  9. X.Org Looks To Have Six Summer Projects
  10. DragonFlyBSD Pulls In GCC 5 Compiler
Most Viewed News This Week
  1. Nouveau: NVIDIA's New Hardware Is "VERY Open-Source Unfriendly"
  2. Linux 4.0 Kernel Released
  3. Microsoft Announces An LLVM-Based Compiler For .NET
  4. Linux 4.1 Brings Many Potentially Risky x86/ASM Changes
  5. Encryption Support For EXT4
  6. VirtualBox 5.0 Beta 2 Released
  7. Mozilla Start Drafting Plans To Deprecate Insecure HTTP
  8. Elementary OS 0.3 "Freya" Now Available