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

Development Continues For Supporting EXT4 On NVDIMMs

Free Software

Published on 23 July 2014 04:51 AM EDT
Written by Michael Larabel in Free Software
6 Comments

The large set of 22 patches for supporting the EXT4 file-system on non-volatile DIMM memory is now up to its eighth revision.

Matthew Wilcox and others have been working on allowing the EXT4 file-system to optimally use NVDIMM DRAM when it's treated as a block device. Currently the usage of EXT4 on NVDIMMs is sub-optimal, as explained by Wilcox, "One of the primary uses for NV-DIMMs is to expose them as a block device and use a filesystem to store files on the NV-DIMM. While that works, it currently wastes memory and CPU time buffering the files in the page cache. We have support in ext2 for bypassing the page cache, but it has some races which are unfixable in the current design. This series of patches rewrite the underlying support, and add support for direct access to ext4."

This direct access support for EXT4 and ported from the EXT2 implementation should significantly help out the popular Linux file-system when using NVDIMMs; the direct access (DAX) mode basically avoids double-buffering data before copying it to the device. While these patches are up to revision eight, they haven't yet been pulled into the EXT4 tree for merging into the mainline kernel, but for now can be found via the Linux kernel mailing list.

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. Radeon Linux Benchmarks: Catalyst 15.3 Beta vs. Linux 4.0 + Mesa 10.6-devel
  2. Trying Out The Modern Linux Desktops With 4 Monitors + AMD/NVIDIA Graphics
  3. Turning A Basement Into A Big Linux Server Room
  4. NVIDIA's $1000+ GeForce GTX TITAN X Delivers Maximum Linux Performance
  5. OS X 10.10 vs. Ubuntu 15.04 vs. Fedora 21 Tests: Linux Sweeps The Board
  6. The New Place Where Linux Code Is Constantly Being Benchmarked
Latest Linux News
  1. Blender 2.74 Brings Many Improvements
  2. Qt Creator 3.4 Is Near
  3. Allwinner: "We Are Taking Initiative Actions Internally"
  4. It's Been Five Years Since The Phoronix Visit To Chernobyl
  5. Vulkan, The New Linux Server Room & BioShock Won Linux Users In March
  6. Debian 8.0 Jessie Gets A Release Date
  7. Firefox 37 Coming Today With Heartbeat, HTTPS Bing
  8. OpenIndiana 2015.03 Updates Its Solaris/Illumos Environment
  9. GNOME 3.16 SDK Runtime Now Available
  10. Initial Intel Braxton Support Might Come To Linux 4.1
Most Viewed News This Week
  1. The Big Features Of The Linux 4.0 Kernel
  2. Improved OpenCL Support For Blender's Cycles Renderer
  3. Open-Source Driver Fans Will Love NVIDIA's New OpenGL Demo
  4. Allwinner Continues Jerking Around The Open-Source Community
  5. GNOME 3.16 Released: It's Their Best Release Yet
  6. Ubuntu 15.04 Final Beta Released
  7. Nuclide: Facebook's New Unified IDE
  8. LibreOffice Online: A Cloud Version Of LibreOffice