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 Linux News
  1. GNU Octave 4.0 Released, Includes A GUI & OpenGL
  2. The Latest AMD APU Linux System Being Added To The Farm
  3. Linux Benchmarks Of Intel's Atom Z3735F On The Compute Stick
  4. Fedora's Security Team Continues Closing Old Vulnerabilities
  5. HAMMER2 File-System Now Uses LZ4 Compression By Default
  6. HiSense Chromebook Benchmarks When Running Ubuntu Linux
  7. Mandriva Linux Was Allegedly Brought Down By Employee Lawsuits
  8. GNOME 3.17.2 Is Released As The Latest Look Towards GNOME 3.18
  9. Phoronix Turns 11 Years Old Next Week: How Should We Celebrate?
  10. Ubuntu Community Council Reaffirms Its Decision Against Kubuntu's Leader
Latest Articles & Reviews
  1. Radeon OpenGL Benchmarks On Fedora 22
  2. Btrfs RAID 0/1/5/6/10 Five-Disk Benchmarks On Linux 4.1
  3. Opening The Gates To Our Daily Open-Source Linux Benchmark Results
  4. The Latest Features For Linux Performance Management + Benchmark Monitoring
Most Viewed News This Week
  1. NVIDIA's Proprietary Driver Is Moving Closer With Kernel Mode-Setting
  2. Features Added To Mesa 10.6 For Open-Source GPU Drivers
  3. Friction Building Around An Ubuntu Community Council Decision
  4. Ubuntu's LXD vs. KVM For The Linux Cloud
  5. The Latest Linux Kernel Git Code Fixes The EXT4 RAID0 Corruption Problem
  6. Russia's Baikal Chips End Up Going For A MIPS CPU
  7. The CompuLab Fitlet Is A Neat Little Linux PC With AMD SoC
  8. Linux 4.1-rc5 Kernel Released