performance of JFFS and YAFFS in terms of in-place updates

Dear members,

we're testing the performance btw. JFFS and YAFFS, and we're currently using nand simulator to simulate the nand flash behavior (since we don't have the physical flash for our testing) on linux kernel 2.6.17.

While running both FFS's, we've found out that somehow, JFFS shows much better performance than YAFFS, in terms of in-place updates and erase counts. However, we're not really sure whether this is the right figure, and since we're new in dealing with nand flash memory, we want to be sure if there is a specific(proper) ways to run JFFS on nand simulator., or is there any nand simulator specifically tuned for YAFFS, or is it that simply JFFS is better in terms of in-place updates compared to YAFFS?

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fn:Hyung Gook Yoo
n:Yoo;Hyung Gook
org:OARDC;Korea
adr:;;;Seoul;;;South Korea
email;internet:[email protected]
title:Member of the technical staff
tel;work:+82.2.2194.7562
note:<img src="http://photos1.blogger.com/blogger/6439/404/320/HyungGookYoo_en_400.jpg" border="0" /> x-mozilla-html:TRUE
version:2.1
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Please, elaborate, this is JFFS or JFFS2? JFFS is almost dead.

Best regards,
Artem Bityutskiy (Битюцкий Артём)