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

Kernel Progress On Improving I/O Wait, Interactivity

Linux Kernel

Published on 04 March 2013 10:43 AM EST
Written by Michael Larabel in Linux Kernel
4 Comments

Progress is being made within the Linux kernel for reducing the I/O wait times and system interactivity/responsiveness when dealing with large I/O operations.

One of the well known Linux kernel bugs to be talked about in the past few years has been Bug #12309 from 2008. The bug is about "Large I/O operations result in poor interactive performance and high iowait times."

Among the example I/O operations cited in the original bug posting was backing up the user's home directory with large files, moving messages between large mail directories, running updatedb, or upgrading large numbers of packages with RPM. With these workloads and others, the wait times become very high with extremely degraded interactivity.

The bug has seen more than 600 comments and there's been many I/O improvements made to the Linux kernel over the past five years. While the bug is marked as closed, some Linux desktop users still complain of a sluggish experience when dealing with heavy I/O operations dragging down the system. Fortunately, improvements are still being made to the Linux kernel.

A new update was posted to the bug report this morning is about work that's merged into the Linux 3.9 kernel. Some of the related work includes progress on eliminating the timer-tick while running in user-space by fixing up more code to work without timer interrupts. There's also a scheduler patch to fix a "bouncing cow" problem by when running fewer processes on the system than number of processor cores, the process could be bounced around between cores and yield poor performance. This bouncing cow fix for the scheduler yields a performance boost by 15x in a worst-case scenario. More work will come to future Linux kernel releases.

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 Articles & Reviews
  1. Samsung 850 EVO SSD Linux Benchmarks
  2. Kubuntu 15.04 Is Turning Out Quite Nice, Good Way To Try Out The Latest KDE
  3. 5-Way Linux Distribution Comparison On The Core i3 NUC
  4. OCZ ARC 100 Linux SSD Benchmarks
  5. Lenovo ThinkPad X1 Carbon Works Great As A Linux Ultrabook
  6. Transcend SSD370 256GB
Latest Linux News
  1. Kdenlive Ported To Qt5/KF5, Coming To KDE Applications 15.04
  2. HTC & Valve Partnered Up For The Steam VR Headset
  3. 8cc: A Small C11 Compiler
  4. Not Everyone Likes The Possible "VULKAN" Name For Next-Gen OpenGL
  5. The Binary Blobs Making Up Coreboot
  6. Linux 4.0 & LLVM vs. GCC Yielded Much Interest This Month
  7. XBMC/Kodi 15.0 Alpha 1 Released
  8. Xfce 4.12 Released After Nearly Three Years Of Work
  9. The Khronos Group Filed A Trademark On "Vulkan" API
  10. Mozilla Thunderbird Adoption Climbs, Thunderbird 38 In May
Most Viewed News This Week
  1. Linux 4.0-RC1 Tagged, Linux 4.0 Will Bring Many Notable Improvements
  2. Screenshots Of The GNOME 3.16 Changes
  3. More Proof That Allwinner Is Violating The GPL
  4. The Tremendous Features Of Fedora 22
  5. Krita 2.9 Released, Their Biggest Release Ever
  6. Linux 4.0 Doesn't Have The Weirdest Codename
  7. A Single UEFI Executable With The Linux Kernel, Initrd & Command Line
  8. Canonical Comes Up With Its Own FUSE Filesystem For Linux Containers
%%CLICK_URL_UNESC%%