btrfs

Thinking about taking the leap to btrfs... Here are some bonnie++ numbers for ext3 & btrfs filesystems mounted via loopback, as well as the raw underlying filesystem (ext3):

                              ext3  btrfs    raw
Sequential Output (Char)       491    309    790
Sequential Output (Block)    78512  50047  58462
Sequential Output (Rewrite)  28843  32065  31820
Sequential Input (Char)       2200   3887   2725
Sequential Input (Block)     70306  79169  78204
Random Seeks                   156    114    175

Nothing too interesting, but it looks like sequential input performed well. Sequential output didn't (but the ext3/loopback did much better than ext3/raw, so maybe it's just noise?).