Just an FYI reminder. The original test (2K files) is utterly pathological for disk drives with 4K physical sectors, such as those now shipping from WD, Seagate, and others. Some of the SSDs have larger (16K0 or smaller blocks (2K). There is also the issue of btrfs over RAID (which I know is not entirely sensible, but which will happen).
The absolute minimum allocation size for data should be the same as, and aligned with, the underlying disk block size. If that results in underutilization, I think that's a good thing for performance, compared to read-modify-write cycles to update partial disk blocks. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
