JFFS2, UBIFS, and the growth of flash storage

Thanks for the new data point. Running with active_logs=4 obviously adds some overhead in the file system because the f2fs garbage collection becomes less efficient and it has to rewrite stuff more. It's not clear whether we get into the case I described but I think you have shown that the extra overhead in the file system is larger than what we save in the device.

I agree on the read numbers, they are probably just in the noise because in theory there is no difference at all based on the mount option.

One thing that would make a very significant difference though is whether the file system is aged and how full it is, but that is true for all of the tests you did.