linux-kernel - Ext2/3 Filesystem Analysis

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Message-ID: <AANLkTinfPl-JAP_4ZzdzJf2uyWcZ_0qfRQiT16_D8Pdd@mail.gmail.com>
Date:	Wed, 9 Jun 2010 15:11:20 +0530
From:	"Yedire, Sandeep" <syedire@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Ext2/3 Filesystem Analysis

Hi All,

I am currently working on Ext2/3 filesystem analysis on SLC NAND Flash device.

I have added code at driver level to note the erase and write count to
each sectors at NAND flash device.

With test application doing read/write of 64MB file with a particular
pattern, I have noted below results
With Ext2:
Filesystem block at Sector 0 is being updated more frequently at ratio
of 4 to 4.5 times that of data block.
Filesystem block(super block copies) are being updated at twice the
frequency compared to data block.

With Ext3:
Filesystem block at Sector 0 is being updated more frequently at ratio
of 5.5 to 6 times that of data block.
Filesystem block(super block copies) are being updated at around
1.5times the frequency compared to data block.

Has anyone come across this kind of behaviour with these filesystems
on NAND Flash?
Please comment on this results.
Many thanks,
Sandeep
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