btrfs latency

Still running 3.10-3-rpi alas because there isn't a 3.14.15 :) version of the pi kernel yet, but is an increasing latency as the uptime increases, expected? Reboot the kernel, and I go back to having 0.1second latency on my SD card in the pi. But after a few weeks, it will be back to 2 second latencies: http://rather.puzzling.org/munin-cgi/pi/pi/diskstats_latency/mmcblk0.html (it started exhibiting this behaviour after the last reboot in January because that's when I installed a btrfs capable kernel and ran ext3tobtrfs over it. Yes, I've deleted the ext3 image snapshot) -- Tim Connors