Btrfs Gets Improved Performance On Linux 3.8 Kernel
Written by Michael Larabel in Linux Kernel on 17 December 2012 at 06:02 PM EST. 3 Comments
The Btrfs file-system updates for the Linux 3.8 kernel will feature performance improvements among other work. Btrfs RAID 5/6 support is also to be published this week.

Here's the key part of the Btrfs 3.8 feature pull request from Chris Mason:
In terms of line count, most of the code comes from Stefan, who added the ability to replace a single drive in place. This is different from how btrfs normally replaces drives, and is much much much faster.

Josef is plowing through our synchronous write performance. This pull request does not include the DIO_OWN_WAITING patch that was discussed on the list, but it has a number of other improvements to cut down our latencies and CPU time during fsync/O_DIRECT writes.

Miao Xie has a big series of fixes and is spreading out ordered operations over more CPUs. This improves performance and reduces contention.

I've put in fixes for error handling around hash collisions. These are going back to individual stable kernels as I test against them.

Otherwise we have a lot of fixes and cleanups, thanks everyone! raid5/6 is being rebased against the device replacement code. I'll have it posted this Friday along with a nice series of benchmarks.
The performance improvements will be much appreciated since with the EXT4 vs. Btrfs vs. XFS benchmarks from the Linux 3.7 kernel, the next-generation Btrfs file-system lost in a number of the test cases. There's also numbers from Btrfs mount option tuning for maximum performance.

The hash collision fixes is another big item to address the recent Btrfs security vulnerability that could lead to a hash-based denial-of-service attack.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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