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

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%.

<< Previous Page
1
Latest Linux Hardware Reviews
  1. Rosewill RS-MI-01: An Ultra Low-Cost Mini-ITX Chassis
  2. D-Link DCS-2330L HD Wireless Network Camera
  3. Gigabyte AM1M-S2H
  4. AMD's New Athlon/Semprons Give Old Phenom CPUs A Big Run For The Money
Latest Linux Articles
  1. AMD Catalyst 14.4 On Linux With Radeon R3 APU Graphics
  2. Red Hat Enterprise Linux 7.0 RC Benchmarks
  3. AMD Catalyst 14.4 Brings Few Linux Performance Improvements
  4. The Performance Of Fedora 20 Updated
Latest Linux News
  1. NGINX 1.6 Brings SPDY 3.1 & Other New Features
  2. Linux Foundation Announces A Core Infrastructure Initiative
  3. More Steam Linux Tests/Benchmarks Might Be Coming
  4. NVIDIA's Amazing Single-Board ARM Computer Might Be Delayed
  5. Fedora 21 To Get A Playground, New Features
  6. PC-BSD Is Developing Its Own Desktop Environment
  7. Valve Is Bringing VOGL To Windows & Working On Regression Tests
  8. Canonical Is Taking Over Linux 3.13 Kernel Maintenance
  9. Google Web Designer Is Now Natively Available On Linux
  10. Ubuntu 14.10 Is Codenamed The Utopic Unicorn
  11. Audacious 3.5 Lightweight Audio Player Released
  12. Steam Updated For Ubuntu 14.04 LTS, SteamOS
Latest Forum Discussions
  1. What Else Would You Like To See On Phoronix This Spring?
  2. HTPC-upgrade advice: AMD Richland A8-7600 or Kaveri A10-6700T ???
  3. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  4. The GNOME Foundation Is Running Short On Money
  5. The Most Amazing OpenGL Tech Demo In 64kb
  6. Announcing radeontop, a tool for viewing the GPU usage
  7. New card. Open source drivers only.
  8. Script for Fan Speed Control