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 3.10 Kernel Integrates BCache HDD/SSD Caching

Linux Kernel

Published on 09 May 2013 01:27 AM EDT
Written by Michael Larabel in Linux Kernel
11 Comments

After being in development for more than one year, BCache was finally merged on Wednesday into the mainline Linux kernel code-base. BCache serves as an SSD caching framework for Linux by offering write-through and write-back caching through a newly-exposed block device.

The block device driver pull was merged Wednesday afternoon. Arguably the most interesting block driver feature to be added to the Linux 3.10 kernel is BCache.

BCache comes down to being a Linux kernel block layer cache where one or more SSDs (or other fast storage devices) can act as a cache for slower rotating disk drives, in somewhat a similar manner to some of the "SSHD" hybrid drives now on the market. BCache is similar to the L2Arc feature exposed on Oracle's ZFS file-system, but with being at the block device level, it's file-system agnostic. BCache is targeting the caching of random reads and writes to the faster storage medium than sequential I/O.

Aside from the supported Linux 3.10 (and later) kernel, there's also user-space "bcache-tools" that are needed for creating the cache and backing devices. When BCache devices are formatted for use, they are then registered with the kernel through a sysfs file.

For more details on BCache itself, read the Linux kernel documentation and the BCache Wiki.

Benchmarks and trial experiences with BCache in the Linux 3.10 kernel when paring HDDs and SSDs will come in a future Phoronix article.

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. Russia's Baikal Chips End Up Going For A MIPS CPU
  2. Mesa Git OpenGL Tests With Intel Ivy Bridge Graphics
  3. Blender 2.75 Allows For AMD OpenCL Support
  4. GNOME's Mutter 3.17.2 Adds X11/Wayland Clipboard Interoperation
  5. Wayland 1.8 RC2 Arrives Along With New Weston Compositor Release
  6. LLVM 3.7 Is Planned For A Late August Release
  7. The OpenGL ES 3.1 Foundation Is Being Laid In Mesa
  8. There Are 140k Benchmark Results So Far On LinuxBenchmarking.com
  9. LLVM 3.6.1 Brings R600 & MIPS Fixes
  10. Friction Building Around An Ubuntu Community Council Decision
Latest Articles & Reviews
  1. Opening The Gates To Our Daily Open-Source Linux Benchmark Results
  2. The Latest Features For Linux Performance Management + Benchmark Monitoring
  3. Noctua NH-U12DX i4 + NF-F12
  4. Btrfs RAID 0/1 Benchmarks On The Linux 4.1 Kernel
Most Viewed News This Week
  1. The Linux 4.0 EXT4 RAID Corruption Bug Has Been Uncovered
  2. NVIDIA's Proprietary Driver Is Moving Closer With Kernel Mode-Setting
  3. Systemd 220 Has Finally Been Released
  4. Microsoft Open-Sources The Windows Communication Foundation
  5. Zapcc Claims To Be A "Much Faster C++ Compiler"
  6. LibreOffice 5.0 Beta 1 Released
  7. Another HTTPS Vulnerability Rattles The Internet
  8. LibreOffice 5.0 Open-Source Office Suite Has Been Branched