From: xemc <xemcnet@gmail.com>
To: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
Cc: Linux MTD mailing list <linux-mtd@lists.infradead.org>
Subject: Re: JFFS3 & performance
Date: Wed, 22 Dec 2004 12:14:18 -0600 [thread overview]
Message-ID: <1f9886eb0412221014256b83e6@mail.gmail.com> (raw)
In-Reply-To: <20041222172637.GE9783@wohnheim.fh-wedel.de>
> adler32 is strong agains 1bit errors:
...
> adler32 is relatively strong against 2bit erros:
...
> For higher level errors, adler32 should have the usual a-priori
> chances of catching them.
...
> Overall, it is not as good as crc32, but pretty close, esp. for long
> data. I would entrust my personal data to it, provided that the
> device in general is good enough and the first adler32 checksum
> failure (ignoring power-failure during writes) results in a message to
> discard the broken flash chips or something similar.
Please forgive me if this is a naive question, but isn't this data
also protected by ECC in the first place? (or is that just for NAND?)
How strong is this ECC compared to CRC32 or Adler32?
If the ECC can handle a few bit errors, then wouldn't a simple
checksum handle the case where the file was completely corrupt or
partially written?
Please correct any wrong assumptions.
Thanks,
Mike
next prev parent reply other threads:[~2004-12-22 18:14 UTC|newest]
Thread overview: 196+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-16 13:20 JFFS3 & performance Joakim Tjernlund
2004-12-16 14:27 ` Artem B. Bityuckiy
2004-12-16 14:45 ` Joakim Tjernlund
2004-12-16 14:50 ` Artem B. Bityuckiy
2004-12-16 15:00 ` Joakim Tjernlund
2004-12-16 17:53 ` Jörn Engel
2004-12-16 18:42 ` Artem B. Bityuckiy
2004-12-16 19:15 ` Jörn Engel
2004-12-16 19:49 ` Jörn Engel
2004-12-16 19:58 ` Joakim Tjernlund
2004-12-16 20:46 ` Jörn Engel
2004-12-16 20:02 ` Joakim Tjernlund
2004-12-16 20:37 ` Thomas Gleixner
2004-12-16 20:51 ` Jörn Engel
2004-12-16 21:02 ` Thomas Gleixner
2004-12-16 21:06 ` Joakim Tjernlund
2004-12-16 21:22 ` Jörn Engel
2004-12-16 22:06 ` Joakim Tjernlund
2004-12-17 10:25 ` Jörn Engel
2004-12-17 10:44 ` Joakim Tjernlund
2004-12-17 10:56 ` Artem B. Bityuckiy
2004-12-17 10:46 ` jasmine
2004-12-17 11:01 ` Artem B. Bityuckiy
2004-12-17 11:19 ` Joakim Tjernlund
2004-12-18 16:09 ` Jörn Engel
2004-12-18 16:26 ` Joakim Tjernlund
2004-12-18 16:52 ` Jörn Engel
2004-12-17 11:10 ` Joakim Tjernlund
2004-12-17 11:20 ` Artem B. Bityuckiy
2004-12-22 13:36 ` Artem B. Bityuckiy
2004-12-22 14:03 ` Jörn Engel
2004-12-22 14:44 ` Artem B. Bityuckiy
2004-12-22 15:14 ` Jörn Engel
2004-12-22 15:25 ` Artem B. Bityuckiy
2004-12-22 16:08 ` Jörn Engel
2004-12-22 20:22 ` xemc
2004-12-22 20:43 ` xemc
2004-12-22 20:49 ` Jasmine Strong
2004-12-22 15:30 ` Joakim Tjernlund
2004-12-22 15:37 ` Artem B. Bityuckiy
2004-12-22 15:47 ` Joakim Tjernlund
2004-12-22 15:56 ` Artem B. Bityuckiy
2004-12-22 16:09 ` Jörn Engel
2004-12-22 16:17 ` Artem B. Bityuckiy
2004-12-22 16:43 ` Joakim Tjernlund
2004-12-22 16:46 ` Artem B. Bityuckiy
2004-12-22 17:26 ` Jörn Engel
2004-12-22 18:14 ` xemc [this message]
2004-12-22 18:20 ` Artem B. Bityuckiy
2004-12-23 13:52 ` Jörn Engel
2004-12-23 17:02 ` Artem B. Bityuckiy
2005-01-07 11:10 ` Artem B. Bityuckiy
2005-01-07 11:09 ` David Woodhouse
2005-01-07 11:27 ` jasmine
2005-01-07 11:43 ` Artem B. Bityuckiy
2005-01-07 14:23 ` Artem B. Bityuckiy
2005-01-07 14:27 ` jasmine
2005-01-07 14:33 ` Artem B. Bityuckiy
2005-01-07 14:37 ` jasmine
2005-01-07 14:43 ` Artem B. Bityuckiy
2005-01-07 14:55 ` jasmine
2005-01-07 15:20 ` Artem B. Bityuckiy
2005-01-07 15:24 ` jasmine
2005-01-07 15:28 ` Artem B. Bityuckiy
2005-01-07 15:31 ` jasmine
2005-01-07 15:32 ` Artem B. Bityuckiy
2005-01-07 17:57 ` Artem B. Bityuckiy
2005-01-07 14:50 ` Artem B. Bityuckiy
2005-01-07 14:31 ` Artem B. Bityuckiy
2005-01-06 10:08 ` Artem B. Bityuckiy
2005-01-08 20:14 ` Jörn Engel
2005-01-09 11:39 ` Artem B. Bityuckiy
2005-01-10 14:24 ` Jörn Engel
2004-12-22 15:59 ` jasmine
2004-12-22 16:19 ` Jörn Engel
2004-12-22 16:21 ` Artem B. Bityuckiy
2004-12-22 15:56 ` Jörn Engel
2004-12-22 16:39 ` Joakim Tjernlund
2004-12-22 17:33 ` Jörn Engel
2004-12-17 11:20 ` Jörn Engel
2004-12-18 12:23 ` Artem B. Bityuckiy
2004-12-21 14:45 ` Artem B. Bityuckiy
2004-12-21 16:03 ` Jörn Engel
2004-12-17 11:33 ` David Vrabel
2004-12-17 15:34 ` Joakim Tjernlund
2004-12-18 16:14 ` Jörn Engel
2004-12-18 16:25 ` Joakim Tjernlund
2004-12-18 16:39 ` Jörn Engel
2004-12-18 17:10 ` Joakim Tjernlund
2004-12-18 17:19 ` Jörn Engel
2004-12-18 17:51 ` Joakim Tjernlund
2004-12-18 17:59 ` Jörn Engel
2004-12-18 18:13 ` Joakim Tjernlund
2004-12-19 3:05 ` Jörn Engel
2004-12-18 18:09 ` Joakim Tjernlund
2004-12-21 14:38 ` Jörn Engel
-- strict thread matches above, loose matches on Subject: below --
2005-01-11 12:29 Artem B. Bityuckiy
2005-01-11 14:37 ` Josh Boyer
2005-01-11 21:51 ` Jörn Engel
2005-01-12 0:06 ` Thomas Gleixner
2005-01-12 16:59 ` Jörn Engel
2005-01-12 17:37 ` Thomas Gleixner
2005-01-12 18:17 ` Jörn Engel
2005-01-12 9:15 ` Artem B. Bityuckiy
2005-01-12 16:41 ` Jared Hulbert
2005-01-12 17:02 ` Jörn Engel
2005-01-12 17:06 ` David Woodhouse
2005-01-12 17:11 ` Jörn Engel
2005-01-12 17:22 ` Jared Hulbert
2005-01-12 17:28 ` Artem B. Bityuckiy
2005-01-12 17:34 ` David Woodhouse
2005-01-12 17:45 ` Dan Post
2005-01-12 17:52 ` David Woodhouse
2005-01-12 17:14 ` Artem B. Bityuckiy
2005-01-12 22:30 ` Jared Hulbert
2005-01-12 22:43 ` Josh Boyer
2005-01-12 22:55 ` Jared Hulbert
2005-01-13 15:50 ` Josh Boyer
2005-01-13 18:30 ` Jared Hulbert
2005-01-13 18:36 ` David Woodhouse
2005-01-13 19:06 ` Jörn Engel
2005-01-13 19:22 ` Josh Boyer
2005-01-13 18:55 ` Artem B. Bityuckiy
2005-01-13 19:10 ` Brian Fox
2005-01-13 19:23 ` Artem B. Bityuckiy
2005-01-28 6:08 ` Eric W. Biederman
2005-01-13 7:54 ` David Woodhouse
2005-01-13 8:25 ` Artem B. Bityuckiy
2005-01-13 15:09 ` Jörn Engel
2005-01-12 18:10 ` Jörn Engel
2005-01-12 18:27 ` Thomas Gleixner
2005-01-12 18:40 ` Jörn Engel
2005-01-12 18:42 ` David Woodhouse
2005-01-12 18:43 ` Artem B. Bityuckiy
2005-01-12 19:16 ` Thomas Gleixner
2005-01-12 19:44 ` Jörn Engel
2005-01-12 19:53 ` Thomas Gleixner
2005-01-12 20:06 ` Jörn Engel
2005-01-12 18:33 ` Artem B. Bityuckiy
2005-01-12 18:43 ` Jörn Engel
2005-01-12 18:45 ` Artem B. Bityuckiy
2005-01-12 18:58 ` Artem B. Bityuckiy
2005-01-12 19:50 ` Jörn Engel
2005-01-13 14:49 ` Artem B. Bityuckiy
2005-01-13 15:05 ` Artem B. Bityuckiy
2005-01-13 15:17 ` Jörn Engel
2005-01-13 15:22 ` Artem B. Bityuckiy
2005-01-13 15:40 ` Jörn Engel
2005-01-13 15:49 ` David Woodhouse
2005-01-13 15:53 ` Artem B. Bityuckiy
2005-01-13 16:13 ` Jörn Engel
2005-01-13 16:16 ` Artem B. Bityuckiy
2005-01-13 16:21 ` Jörn Engel
2005-01-13 16:22 ` Artem B. Bityuckiy
2005-01-13 16:21 ` Artem B. Bityuckiy
2005-01-14 13:46 ` Jamey Hicks
2005-01-14 14:16 ` Artem B. Bityuckiy
2005-01-18 15:50 ` Joakim Tjernlund
2005-01-19 13:07 ` Artem B. Bityuckiy
2005-01-19 15:24 ` Jörn Engel
2005-01-19 15:27 ` Artem B. Bityuckiy
2005-01-19 15:32 ` Jörn Engel
2005-01-19 15:51 ` Artem B. Bityuckiy
2005-01-19 16:31 ` Jörn Engel
2005-01-19 19:58 ` Artem B. Bityuckiy
2005-01-20 14:35 ` Jörn Engel
2005-01-20 14:37 ` David Woodhouse
2005-01-20 14:40 ` Jörn Engel
2005-01-20 15:05 ` Artem B. Bityuckiy
2005-01-20 15:27 ` Jörn Engel
2005-01-20 15:37 ` Artem B. Bityuckiy
2005-01-20 16:13 ` Jörn Engel
2005-01-20 16:31 ` Artem B. Bityuckiy
2005-01-20 16:41 ` Jörn Engel
2005-01-20 17:08 ` Artem B. Bityuckiy
2005-01-20 17:33 ` Jörn Engel
2005-01-20 17:57 ` Artem B. Bityuckiy
2005-01-21 12:44 ` Jörn Engel
2005-01-21 13:13 ` Artem B. Bityuckiy
2005-01-21 13:42 ` Jörn Engel
2005-01-21 13:52 ` Artem B. Bityuckiy
2005-01-21 14:00 ` Jörn Engel
2005-01-21 14:04 ` Artem B. Bityuckiy
2005-01-25 10:51 ` Jörn Engel
2005-01-25 10:56 ` David Woodhouse
2005-01-25 11:13 ` Jörn Engel
2005-01-21 14:30 ` Josh Boyer
2005-01-21 22:33 ` Jared Hulbert
2005-01-21 22:46 ` Jared Hulbert
2005-01-21 23:54 ` Josh Boyer
2005-01-22 13:03 ` Artem B. Bityuckiy
2005-01-22 22:04 ` David Woodhouse
2005-01-23 10:03 ` Artem B. Bityuckiy
2005-01-23 10:08 ` Artem B. Bityuckiy
2005-01-23 11:04 ` David Woodhouse
2005-01-23 11:55 ` Artem B. Bityuckiy
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