Required memory size for jffs2.

[Russ Dill]

> I could hardly believe the results. jffs2 requires too much memory!!
> 

yes, its *very* advanced, and *very* nifty. I don't know how you
factored in buffered and cached memory, but it may be mostly that.
Also, yaffs has been designed for the purpose of using on large amounts
of NAND flash, quickly and with low overhead, so if you are using a large
amount of NAND flash, you may look into that.