From: Jared Hulbert <jaredeh@gmail.com>
To: Josh Boyer <jdub@us.ibm.com>
Cc: MTD List <linux-mtd@lists.infradead.org>,
David Woodhouse <dwmw2@infradead.org>
Subject: Re: JFFS3 & performance
Date: Wed, 12 Jan 2005 14:55:57 -0800 [thread overview]
Message-ID: <6934efce05011214553465438@mail.gmail.com> (raw)
In-Reply-To: <1105569824.3896.44.camel@weaponx.rchland.ibm.com>
> That's not true. Eraseblocks can go bad during operation. That doesn't
> mean that the whole device returns bad data.
Sure, during an erase... How does a checksum help you here?
> CRCs are needed. Or rather, some form of checksum is needed. Bits flip
> during operation on NOR as well. I've seen it happen. It's rare, but
> as David put it in an IRC conversation "it's a sanity check on the
> hardware".
>
> There's sort of multiple threads on this topic, so maybe check some of
> those. We even got Joern to agree they're needed :).
I respectfully disagree. I don't think checksums are needed to
protect you from NOR read errors *unless* the checksums are the only
thing protecting the filesystem from bad things like crashes, power
failures, and bugs.
next prev parent reply other threads:[~2005-01-12 22:55 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 [this message]
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
-- 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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