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

A Proposal To Change The Default I/O Scheduler

Linux Kernel

Published on 10 April 2012 01:01 PM EDT
Written by Michael Larabel in Linux Kernel
10 Comments

A patch was volleyed into the Linux kernel development camp to change the default I/O scheduler for non-SATA disk drives.

Vivek Goyal, a Red Hat developer, questioned whether CFQ as the default scheduler in the Linux kernel is still the right choice. CFQ works well on a slow, rotational media like some Serial ATA disk drives, but under-performs for faster storage arrays, PCI-E solid-state drives, virtualized disks, etc. Therefore he's sent in a patch that would change the disk scheduler default for non-SATA drives to being the deadline scheduler rather than CFQ. Making deadline the default over CFQ for these faster storage mediums should provide a speed boost.

The Completely Fair Queuing scheduler has been the default since 2006 when it replaced the anticipatory scheduler as the mainline default.

From Vivek on the kernel mailing list, "One can argue that some SAS disks can be slow too and benefit from CFQ. Yes, but default IO scheduler choice is not perfect anyway. It just tries to cater to a wide variety of use cases out of the box. So I am throwing this patch out see if it flies. Personally, I think it might turn out to be a more reasonable default."

If other kernel developers agree, the default I/O scheduler could be changed for the Linux 3.5 kernel.

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. Intel Pentium G3258 On Linux
  2. SilverStone Precision PS10
  3. ASRock Z97 Extreme6
  4. Nouveau Re-Clocking Is Way Faster, Shows Much Progress For Open-Source NVIDIA
Latest Linux Articles
  1. KVM Benchmarks On Ubuntu 14.10
  2. X.Org Server 1.16 Officially Released With Terrific Features
  3. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air
  4. Preview: Benchmarking CentOS 7.0 & Scientific Linux 7.0
Latest Linux News
  1. Libinput 0.5 Improves Pointer Acceleration, Adds A Configuration API
  2. QEMU 2.1.0-rc3 Has More Bug Fixes
  3. Linux 3.17 To Fix Up ASPM, Bring Other PCI Changes
  4. CPUFreq Ondemand Could Be Faster, Use Less Power With Linux 3.17
  5. Intel Adds BPTC Texture Compression To Their Mesa Driver
  6. The Linux Kernel Bang-Bang Thermal Governor Is Banging
  7. NVIDIA Releases K1-Powered Shield Tablet & Controller
  8. Xen Project Announces Mirage OS 2.0
  9. Canonical Community Team Changes Announced For Ubuntu
  10. Raspberry Pi B+ ARM Debian Benchmarks
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Remote gui not accessible in Phoronix Test Suite 5.2
  3. AMD "Hawaii" Open-Source GPU Acceleration Still Not Working Right
  4. Open-Source Radeon Performance Boosted By Linux 3.16
  5. In Road To Qt, Audacious Switches From GTK3 Back To GTK2
  6. Debian + Steam + r600
  7. Next-Gen OpenGL To Be Announced Next Month
  8. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air