&totse users ran tests of zfs-fuse back in the day and found that it was actually noticeably slower than native ext3. From that, I'm inclined to argue the oppos

&totse users ran tests of zfs-fuse back in the day and found that it was actually noticeably slower than native ext3. From that, I'm inclined to argue the opposite: filesystems should almost definitely be in-kernel. Granted, their tests were on Linux, not on a modern microkernel.