Btrfs File-System For Old Computers?
Recently I published benchmarks of Btrfs from a Serial ATA 3.0 SSD (the excellent OCZ Vertex 3 SSD) and those results were interesting, but most people aren't running 6Gb/s solid-state drives, so how does this next-generation file-system perform on the opposite end of the spectrum? In this article are EXT4 and Btrfs benchmarks from an old Core Duo notebook with a 5400RPM mobile hard drive.
This testing is just like the earlier Btrfs SATA 3.0 benchmarks, but with more Btrfs mount options being tested and with old hardware being used. In particular, a Lenovo ThinkPad T60 was used with a 1.86GHz Core Duo T2400 CPU with 1GB of RAM and a Hitachi HTS541080G9SA00 HDD. The Hitachi hard drive spins at 5400RPM, complies with SATA 1.0, has 8MB of cache, and has a 12ms average seek time. Full system details are below.
An Ubuntu 11.10 development snapshot was running on this 32-bit laptop with the latest Linux 3.1 development kernel loaded at the time of testing. The EXT4 file-system was tested along with Btrfs. Between each mount option that was tested, the Btrfs file-system was re-formatted. The mount options included compress=zlib, compress=lzo, space_cache, autodefrag, nodatasum, nodatacow, and nobarrier. Below is a description of the tested Btrfs mount options from the Btrfs Wiki.
- nodatasum: Do not checksum data. Means bit flips and bit rot might go undetected, but allows for slightly faster operation since data checksum does not have to be calculated. On most modern CPUs this option does not result in any reasonable performance improvement.
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