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

FIOPS: A New Linux I/O Scheduler For Flash/SSDs

Linux Kernel

Published on 09 January 2012 09:43 AM EST
Written by Michael Larabel in Linux Kernel
15 Comments

Last week a new I/O scheduler was presented for the Linux kernel. This new scheduler, FIOPS, is designed around modern flash-based storage devices like solid-state drives.

Shaohua Li presented FIOPS, the Fair IOPS scheduler, under an "RFC" state last week on the Linux kernel mailing list.

This new I/O scheduler is designed around the following assumptions about Flash-based storage devices: no I/O seek time, read and write I/O cost is usually different from rotating media, time to make a request depends upon the request size, and high through-put and higher IOPS with low-latency. With these flash characteristics in mind, he wrote FIOPS.

CFQ, the commonly used Linux I/O scheduler at present, does well for rotating media but Shaohua believes his new scheduler is better for flash media. At present CFQ only has a few optimizations for SSDs. The design of the Fair IOPS scheduler is similar to CFQ but the dispatch decision is made according to IOPS instead of slice, while being backed by a simple algorithm.

This code is still in-development and thus not a candidate for the Linux 3.3 kernel. Some of the work items still left is ioprio support, request size vios scale, cgroup support, tracing support, and to automatically select the default I/O scheduler in a smart manner.

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. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
  2. MSI: Update Your BIOS From The Linux Desktop
  3. NVIDIA vs. AMD 2D Linux Drivers: Catalyst Is Getting Quite Good At 2D
  4. 15-Way GPU Comparison With Mesa 10.3 + Linux 3.17
Latest Linux News
  1. Linux 3.19 To Have Skylake Graphics, PPGTT Enablement
  2. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  3. Imagination Releases Full ISA Documentation For PowerVR Rogue GPUs
  4. Features GNOME Developers Want In The Linux Kernel
  5. GTK+ Gains Experimental Overlay Scrollbars
  6. Phoronix Test Suite 5.4 M3 Is Another Hearty Update
  7. GParted 0.20 Improves Btrfs Support
  8. EXT4 In Linux 3.18 Has Clean-ups, Bug Fixes
  9. Emacs 24.4 Has Built-In Web Browser, Improved Multi-Monitor Support
  10. NVIDIA's NVPTX Support For GCC Is Close To Being Merged
Latest Forum Discussions
  1. HOPE: The Ease Of Python With The Speed Of C++
  2. Users/Developers Threatening Fork Of Debian GNU/Linux
  3. Proof that strlcpy is un-needed
  4. Bye bye BSD, Hello Linux: A Sys Admin's Story
  5. Updated and Optimized Ubuntu Free Graphics Drivers
  6. NVIDIA Presents Its Driver Plans To Support Mir/Wayland & KMS On Linux
  7. AMD Is Restructuring Again, Losing 7% Of Employees
  8. Open-Source AMD Fusion E-350 Support Takes A Dive