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

EXT4 & Btrfs Regressions In Linux 2.6.36

Michael Larabel

Published on 8 September 2010
Written by Michael Larabel
Page 1 of 3 - 21 Comments

Recently when benchmarking the Btrfs and EXT4 file-systems we were left surprised that the performance of the next-generation Btrfs file-system had regressed against EXT4 to the point where the evolutionary file-system is measurably faster in a greater number of disk benchmarks. In fact, even with solid-state drives and Btrfs offering an SSD optimized mode, it still conceded to EXT4. It turns out that in the Linux 2.6.35 kernel, Btrfs regressed. This regression should have been fixed with the Linux 2.6.36 kernel, but recently when benchmarking EXT4/Btrfs against ZFS-FUSE on a 2.6.36 development snapshot we found its performance to still be poor for Btrfs compared to EXT4. To confirm where these two most prominent Linux file-systems are at right now, we have new EXT4 and Btrfs performance results from the Linux 2.6.34, 2.6.35, and 2.6.36-rc3 kernels.

The EXT4/Btrfs benchmarking on the three latest major kernel releases was done with an OCZ Vertex 2 60GB SSD found in our test rig containing an Intel Core i7 920 CPU overclocked to 3.60GHz, an ASRock X58 SuperComputer, 3GB of DDR3 system memory, and an ATI Radeon HD 4670 graphics card. Ubuntu 10.04.1 LTS was used with GNOME 2.30.2, X.Org Server 1.7.6, xf86-video-ati 6.13.0, GCC 4.4.3, and the three kernels were obtained from the Ubuntu Mainline Kernel PPA.

Tests for looking at EXT4/Btrfs regressions in the mainline Linux kernel were Apache, PostgreSQL, PostMark, SQLite, Gzip, Unpack Linux, Compile Bench, Flexible IO Tester, and Threaded I/O Tester. Obviously, this testing was managed through the Phoronix Test Suite.

The Linux 2.6.35 kernel actually brought performance improvements for our Apache web server benchmark in both the EXT4 and Btrfs file-systems, but with the Linux 2.6.36 kernel the performance did regress atop this Intel Core i7 system. Though as both file-systems regressed in Linux 2.6.36 by roughly the same measure, the regression may be in a more common layer of the kernel and not specific to a particular file-system module. Between Linux 2.6.35 and where we are at now in the Linux 2.6.36 cycle, this is a performance drop of more than 10%.

With the PostgreSQL server benchmark, there was another regression between the Linux 2.6.35 and 2.6.36 kernels that affected both EXT4 and Btrfs.

There was not much of a change in the PostMark performance between the 2.6.34 and 2.6.35 kernels for either EXT4 or Btrfs, but with the Linux 2.6.36-rc3 kernel the performance has fallen significantly. The EXT4 performance is down by 33% and Btrfs is down by 40%.

Latest Linux News
  1. Ubuntu Benchmarking Workloads + Clouds
  2. Ubuntu Touch Is Making Progress On Porting To Systemd
  3. Macaw-Movies: A KDE Movie Organizing Application
  4. SteamOS 159 Drops Support For NVIDIA's Pre-Fermi Graphics Cards
  5. AMD Radeon R9 290: Linux 4.0 vs. Linux 4.1 Git
  6. Ubuntu 15.10 Will Use The GCC 5 Compiler By Default
  7. A Demo Of Ubuntu's Unity 8 On The Desktop
  8. The Unity 8 Items Being Worked On For The Ubuntu Desktop
  9. Fresh, 5-Way Linux Distribution Benchmarks On Amazon's EC2 Cloud
  10. OpenGL 4.1 Extension Implemented For Intel Mesa Sandy Bridge
  11. Xubuntu Team Announces "Xubuntu Core"
  12. Many Ubuntu Phone Updates Are Coming Up Soon
Latest Articles & Reviews
  1. GeForce GTX 750 Series: Nouveau vs. NVIDIA Linux Driver Performance
  2. GLAMOR + RadeonSI 2D Acceleration Is Quite Good For Open-Source AMD 2D Performance
  3. AMD Radeon R9 290 OpenGL On Ubuntu 15.04: Catalyst vs. RadeonSI Gallium3D
  4. Ubuntu 15.04 Offers Faster OpenGL For AMD Radeon GPUs On Open-Source
Most Viewed News This Week
  1. A Lot Of Improvements Are Coming For Mir 0.13, Including Work Towards Libinput
  2. Improvements On The Way For GNOME's Nautilus File Manager
  3. Kodi 15.0 Beta 1 Released
  4. Wayland 1.8 Alpha Release Delayed
  5. Steam Linux Usage Drops Below 1%
  6. Mono 4.0 Makes Use Of Microsoft's Open-Source Code, C# 6.0
  7. Lucid Sleep Support Is Being Worked On For The Upstream Linux Kernel
  8. Microsoft's Visual C++ Team Is Improving Clang For Windows