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 Benchmarking Platform
Phoromatic Test Orchestration

SquashFS Getting Major Performance Enhancements

Linux Kernel

Published on 20 November 2013 07:04 AM EST
Written by Michael Larabel in Linux Kernel
6 Comments

SquashFS is commonly used by Linux distributions as a compressed read-only file-system commonly used by the Live CD/DVD/USB versions of distributions like Ubuntu, Arch, Fedora, Debian, etc. There's some performance improvements to be merged into the Linux kernel that will make SquashFS even faster. SquashFS decompression can be multiple times faster with these patches.

Besides being used for Linux distribution Live CD/DVD/USB environments, the compressed read-only file-system is also used by lightweight embedded Linux distributions like OpenWRT so having faster performance for SquashFS is far reaching. The latest work on improving the performance of SquashFS is by Phillip Lougher, a lead developer of the file-system, and comes via a set of performance enhancements currently residing on the kernel mailing list.

Lougher is planning to get these SquashFS performance patches merged soon; it might be too late for Linux 3.13 but otherwise would be material for the Linux 3.14 kernel. The improvements to SquashFS in the Linux kernel include enhanced parallel I/O, multi-threaded decompression support using perCPU variables, directly decompressing into the page cache for file data, and other changes -- including the refactoring of the decompressor interface and code.

In the change to enhancing parallel I/O by allowing multiple decompressors, one example test done on the patch shows a system with two CPUs and 4GB of RAM going from taking 99 seconds to decompress four SquashFS file-systems to now taking just nine seconds! The multiple decompressor support for SquashFS right now though is hidden behind its own kernel configuration option (SQUASHFS_MULTI_DECOMPRESSOR).

The patch to directly decompress into the page cache for file data showed single-data decompression going from a 13 MB/s to now decompressing at 67 MB/s.

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 News
  1. Trying To Run The Intel Core i7 5775C On Linux
  2. VirtualBox 5.0 RC3 Brings VMM Fixes, Takes Care Of Some KDE DnD Problems
  3. Ubuntu Is Finally Fixing Its Annoying GRUB Setting
  4. Firefox 39.0 Brings New Features, HTML5 Changes
  5. OPNsense 15.7 Released As Fork Of Pfsense
  6. The Less-Powerful Intel Compute Stick With Ubuntu Will Soon Ship
  7. Kodi 15.0 Release Candidate 1 Arrives
  8. Fedora 23: Python 3 Default Approved; Netizen Spin Rejected
  9. GNOME Shell & Mutter Just Landed More Wayland Improvements
  10. Ubuntu MATE Announces A Partnership With A PC Hardware Vendor
Latest Articles & Reviews
  1. 6-Way File-System Comparison On The Linux 4.1 Kernel
  2. How KDE VDG Is Trying To Make Open-Source Software Beautiful
  3. Attempting To Try Out BCache On The Linux 4.1 Kernel
  4. CompuLab's Fitlet Is A Very Tiny, Fanless, Linux PC With AMD A10 Micro
Most Viewed News This Week
  1. Pinos Is For Linux Video What PulseAudio Is For Audio
  2. The State & Complications Of Porting The Unity Editor To Linux
  3. The Staging Pull For Linux 4.2: "Big, Really Big"
  4. Latest Rumor Pegs Microsoft Wanting To Buy AMD
  5. "PulseVideo" Coming To Complement PulseAudio?
  6. Exciting Features Merged So Far For The Linux 4.2 Kernel
  7. RadeonSI Gallium3D Gets New OpenGL 4 Bits
  8. Linux 4.2 Advertises GFS2 Performance Improvements