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

Linux Kernel Still Picking Up AVX Optimizations

Linux Kernel

Published on 19 December 2012 01:04 AM EST
Written by Michael Larabel in Linux Kernel
2 Comments

Advanced Vector Extensions (AVX) have been present in Intel and AMD hardware since last year with Sandy Bridge and Bulldozer processors, respectively, but their use isn't too very widespread at this point. Fortunately, the Linux kernel has been receiving some AVX1/AVX2 optimizations.

The AVX instruction set extensions are designed to better floating-point-intensive applications, increased parallelism for floating-point SIMD calculations, and reduce register loads in certain conditions (You can find additional information via Wikipedia). The Linux kernel has had basic AVX support going back to 2009, but it hasn't been until recently that there's been more AVX-optimized functions appearing within the kernel.

Already for the Linux 3.8 kernel merge window there were the Intel cryptography performance improvements. Intel added an AVX implementation for the Camellia cipher along with AVX optimizations for CAST5/CAST6/Serpent/Twofish. That's not all but today in a different part of the kernel there's now some AVX2 optimizations.

Sandy Bridge CPUs with AVX1 support are nearly two years old while just a few months out is Advanced Vector Extensions 2 (AVX2). AVX2 builds upon AVX1 by making most integer instructions 256-bit, three-operand bit manipulation and multiply, Gather support, vector shifts, and other new features.

The AVX2 work today comes via the MD layer pull that provides AVX2-optimized functions for RAID6 calculations with disks. The commits are "lib/raid6: Add AVX2 optimized gen_syndrome functions" and "lib/raid6: Add AVX2 optimized recovery functions."

Let's hope other prominent open-source projects also continue to pick-up support for these newer CPU instruction set extensions to enhance Linux performance.

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. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  2. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  3. OCZ Vector 150 SSD On Linux
  4. Noctua i4 CPU Cooler: Great For Cooling High-End LGA-2011v3 CPUs
Latest Linux Articles
  1. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  2. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  3. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
  4. 6-Way Winter 2014 Linux Distribution Comparison
Latest Linux News
  1. FSF's High Priority Project List Now Has A Committee
  2. Details On Using OpenACC & GPUs With GCC
  3. Ubuntu 15.04 Alpha 1 For Its Various Flavors
  4. Git 2.2.1 Released To Fix Critical Security Issue
  5. WTFTW: A Tiling Window Manager Written In Rust
  6. Jolla's Sailfish OS Update 10 Is Now Available
  7. HP To Launch Linux++ Operating System Next Year
  8. Civilization: Beyond Earth Launches For Linux
  9. NIR Has Been Revised As A New IR For Mesa
  10. New 64-bit Linux Kernel Vulnerabilities Disclosed This Week
Latest Forum Discussions
  1. XLennart: A Game For Systemd Haters With Nothing Better To Do
  2. Debian init discussion in Phoenix Wright format
  3. Bench specific mount point
  4. Tool for measuring FPS in games
  5. Need some hand holding with upgrading xserver
  6. Ubuntu Developers Still Thinking What To Do About Adobe Flash Support
  7. Microsoft buying Mojang
  8. Updated and Optimized Ubuntu Free Graphics Drivers