Chris Murphy posted on Sun, 11 Sep 2016 14:33:18 -0600 as excerpted: > Something else that's screwy in that bug that I just realized, why is it > not defaulting to mixed-block groups on a 100MiB fallocated file? I > thought mixed-bg was the default below a certain size like 2GiB or > whatever?
You apparently missed the memo... Newer btrfs-progs mkfs.btrfs no longer defaults under-1-GiB to mixed-bg mode, tho it remains very strongly recommended below 1 GiB, and soft- recommended to somewhere between 4 and 32 GiB (I believe the wiki says 5 GiB at this point but don't know how it arrived at that, but the numbers I've seen suggested on-list range between 4 and 32 GiB, as above). The explanation of why, based on the thread where I remember it coming up, was because defaulting to mixed-mode was making testing more complex. Don't ask me to agree with that because I most certainly don't; IMO sane defaults for normal use, which everyone seems to agree mixed- mode for under a GiB is, should apply, and if testing needs special- cased, well, special-case it. But none-the-less, that's the context in which it was agreed to do away with the mixed-mode default, despite it still being extremely strongly recommended for under a GiB. <shrug> -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- 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
