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. Preview: AMD's FX-9590 Eight-Core At Up To 5.0GHz On Linux
  2. Intel Launches The Core i7 5960X, Mighty Powerful Haswell-E CPUs
  3. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
  4. AMD Radeon R9 290 Open-Source Driver Works, But Has A Ways To Go
Latest Linux Articles
  1. How Intel Graphics On Linux Compare To Open-Source AMD/NVIDIA Drivers
  2. The Fastest NVIDIA GPUs For Open-Source Nouveau With Steam Linux Gaming
  3. Testing For The Latest Linux Kernel Power Regression
  4. The Most Energy Efficient Radeon GPU For AMD Linux Gaming
Latest Linux News
  1. Nouveau X.Org Driver Released With DRI3+Present, Maxwell, GLAMOR
  2. Microsoft & AMD Release C++ AMP Compiler With Linux Support
  3. AMD, Wine & Valve Dominated August For Linux Users
  4. Linux 3.17-rc3 Kernel Released Back On Schedule
  5. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  6. Mesa 10.3 RC2 Arrives Via Its New Release Manager
  7. Ubuntu 14.10's Lack Of X.Org Server 1.16 Gets Blamed On AMD
  8. MSI Motherboard BIOS Updating Remains A Pain For Linux Users
  9. See How Your Linux System Performs Against The Latest Intel/AMD CPUs
  10. AMD Steppe Eagle Flys To Coreboot
Latest Forum Discussions
  1. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. AMD Releases UVD Video Decode Support For R600 GPUs
  4. SSD seems slow
  5. Is laptop with Intel CPU and AMD dGPU worth buying considering especially AMD Enduro?
  6. Radeon HD5670 and Ubuntu 14.04
  7. Btrfs Gets Talked Up, Googler Encourages You To Try Btrfs
  8. Updated graphics drivers for Ubuntu 12.04 Precise LTS