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

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 Articles & Reviews
  1. GLAMOR + RadeonSI 2D Acceleration Is Quite Good For Open-Source AMD 2D Performance
  2. AMD Radeon R9 290 OpenGL On Ubuntu 15.04: Catalyst vs. RadeonSI Gallium3D
  3. Ubuntu 15.04 Offers Faster OpenGL For AMD Radeon GPUs On Open-Source
  4. Ubuntu 15.04 Brings Some Graphics Performance Improvements For Intel Haswell
  5. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  6. The Lenovo T450s Is Working Beautifully With Linux
Latest Linux News
  1. A Lot Of Improvements Are Coming For Mir 0.13, Including Work Towards Libinput
  2. Mobile Optimizations Coming For Phoronix
  3. Wayland 1.8 Alpha Release Delayed
  4. Godot Game Engine 1.1 Up To RC State
  5. ATI Rage128 Driver Now Has RandR Support
  6. Microsoft's Visual C++ Team Is Improving Clang For Windows
  7. Kodi 15.0 Beta 1 Released
  8. Lucid Sleep Support Is Being Worked On For The Upstream Linux Kernel
  9. Improvements On The Way For GNOME's Nautilus File Manager
  10. Wine 1.7.42 Implements More Of Direct2D
Most Viewed News This Week
  1. It Doesn't Look Like KDBUS Will Make It For Linux 4.1
  2. Trying Out Microsoft Visual Studio Code On Linux
  3. The Many Features Of The Linux 4.1 Kernel
  4. Microsoft Releases New Code IDE For Linux!
  5. Linux 4.1-rc1 Kernel Released, Packs In Several New Features
  6. GCC 4.9.2 vs. GCC 5 Benchmarks On An Intel Xeon Haswell
  7. QEMU 2.3 Officially Released
  8. Debian 9.0 Is Codenamed Stretch