Benchmarks Of The Btrfs Space Cache Option
When the Btrfs file-system is mounted with the space_cache option, Btrfs is able to store the free space cache on the disk to make the caching of a block group much quicker. Without this support, Btrfs has to scan the entire tree each time looking for space that can be allocated.
With today's testing we are comparing the performance of Btrfs on a newly created Btrfs file-system with the Linux 2.6.37 kernel and the latest user-space utilities using the default mount options, using the space_cache mount option, using the compress mount option for Btrfs file compression, and lastly using both the space_cache and compression mount options to benefit from the free space caching and Zlib compression.
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