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. Acer B286HK: A 28-inch UHD LED 4K Monitor For As Low As $350
  2. Intel Xeon E5-1680 v3 & E5-2687W v3 Compared To The Core i7 5960X On Linux
  3. Intel 120GB 530 Series SSD Linux Performance
  4. Btrfs/EXT4/XFS/F2FS RAID 0/1/5/6/10 Linux Benchmarks On Four SSDs
Latest Linux Articles
  1. Mesa Git Yields Performance Improvements For Newer AMD GPUs
  2. Apple OS X 10.10 vs. Ubuntu 14.10 Performance
  3. Mesa 10.5-devel Brings Some Intel Haswell HD Graphics Changes Over Mesa 10.3
  4. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
Latest Linux News
  1. NVIDIA Posts Tegra Gallium3D Patch For K1+ Support
  2. Ubuntu 14.10 MacBook Air Tests With Linux 3.18, Mesa 10.5
  3. AMD Richland APU Support Added To Coreboot
  4. 2014 Holiday Shopping Reminder, Happy Thanksgiving
  5. Python 3 Support Added To The GNOME Shell
  6. ReactOS Lands Its New Explorer Shell
  7. Weston's IVI Shell Sees New Version
  8. IMP Launches As Another Open-Source Computer Attempt
  9. Git 2.2.0 Released With 550+ Changes
  10. GNOME 3.15.2 Released
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Hurrican SDL Port
  3. Roadmap to Catalyst 14.10 ?
  4. how to configure module phoromatic ?
  5. PulseAudio 6.0 Is Coming & Other Linux Audio Plans For The Future
  6. Debian Developer Resigns From The Systemd Maintainership Team
  7. Cant get working Kaveri APU - A10-7850k
  8. Script for Fan Speed Control