Testing Out The Btrfs Mount Options On Linux 3.2
Earlier this month I benchmarked all the major Linux file-systems of Ubuntu 12.04: ReiserFS, JFS, EXT2, EXT3, EXT4, Btrfs, and XFS. While Btrfs performed well with Ubuntu 12.04 LTS, it was not always the fastest although it does offer the most advanced feature-set. For those looking to tune a Btrfs file-system for performance, published now are some reference benchmarks showing the Linux Btrfs performance with varying mount options.
For this Btrfs mount option testing I used the Intel Core i5 "Sandy Bridge" notebook from the earlier Ubuntu 12.04 LTS article with the Intel X-25 SSD and Ubuntu 12.04 x86_64 operating system with Linux 3.2 kernel. The Btrfs file-system was tested with its default mount options as found from the Ubuntu 12.04 installation (nospacecache,relatime,rw,ssd) and then testing a variety of well-known mount options. The tested Btrfs mount options included space caching, no data copy-on-write, Zlib compression, LZO compression, auto-defrag, and free inode cache.
Below are the relevant mount option descriptions from the Btrfs web-page.
space_cache - Btrfs stores the free space data ondisk to make the caching of a block group much quicker (Kernel 2.6.37+). It's a persistent change and is safe to boot into old kernels.
This testing is quite straightforward so we can move directly to the results from this Ubuntu 12.04 Btrfs benchmarking.
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