From: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
To: Jared Hulbert <jaredeh@gmail.com>
Cc: MTD List <linux-mtd@lists.infradead.org>,
David Woodhouse <dwmw2@infradead.org>
Subject: Re: JFFS3 & performance
Date: Thu, 13 Jan 2005 16:09:27 +0100 [thread overview]
Message-ID: <20050113150927.GA18864@wohnheim.fh-wedel.de> (raw)
In-Reply-To: <6934efce0501121430471e55a8@mail.gmail.com>
On Wed, 12 January 2005 14:30:32 -0800, Jared Hulbert wrote:
>
> Retiring blocks/pages was an idea for the more lossy flash NAND, AND
> etc. If your media goes bad with NOR you probably can't boot anyway.
>
> I'm thinking the opposite conclusion. If I understand this correctly
> most CRC's on NOR are wasted effort. I don't claim to quite
> understand JFFS2 architecture yet but it seems to me the data CRC's
> are not needed for NOR, perhaps some of the other CRC's are not needed
> as well.
I thought the same, but Josh convinced me. NOR *should* just work and
never have problems. Checksums *should* be a wasted effort. But for
some reason, both the flash vendor and quality assurance messed up and
broken flashes got were soldered into products. Nasty.
So at this point, checksums are quite nice because they effectively do
the job that quality assurance should have done.
Jörn
--
When you close your hand, you own nothing. When you open it up, you
own the whole world.
-- Li Mu Bai in Tiger & Dragon
next prev parent reply other threads:[~2005-01-13 15:10 UTC|newest]
Thread overview: 196+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-11 12:29 JFFS3 & performance 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 [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2004-12-16 13:20 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
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
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