From: Kenneth Johansson <kenneth.johansson@etx.ericsson.se>
To: David Woodhouse <dwmw2@infradead.org>
Cc: "Jarkko Lavinen \(NMP/Helsinki\)" <jarkko.lavinen@nokia.com>
Cc: MTD List <linux-mtd@lists.infradead.org>
Subject: Re: JFFS2 mount time
Date: Tue, 13 Jan 2004 17:21:15 +0100 [thread overview]
Message-ID: <1074010874.9216.28.camel@spawn.uab.ericsson.se> (raw)
In-Reply-To: <1074007799.17620.60.camel@hades.cambridge.redhat.com>
On Tue, 2004-01-13 at 16:30, David Woodhouse wrote:
> > When I tried to be smart and skip the copy and only read in what needed
> > to be read that was significantly slower.
>
> Bear in mind that the question was about NAND flash though -- it's not
> directly deferenceable, and you're not going to get the same results.
hmm I reread the firt post why is read so slow?? When I thought about
using nand I read that reading a byte took something like 50 ns. That is
like 20MB per second for an 8 bit device. This is in the region where it
did not pay to be smart,the accesses overhead to do read only what's
needed is greater than the time wasted reading uneccessary data.
next prev parent reply other threads:[~2004-01-13 16:23 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-13 12:50 JFFS2 mount time Jarkko Lavinen (NMP/Helsinki)
2004-01-13 13:19 ` Joakim Tjernlund
2004-01-13 13:39 ` David Woodhouse
2004-01-13 15:25 ` Kenneth Johansson
2004-01-13 15:30 ` David Woodhouse
2004-01-13 16:21 ` Kenneth Johansson [this message]
2004-01-13 17:29 ` Jörn Engel
2004-01-13 17:40 ` Kenneth Johansson
2004-01-13 18:43 ` Jörn Engel
2005-01-04 15:00 ` Steven Scholz
2005-01-05 10:45 ` Artem B. Bityuckiy
2005-01-05 11:10 ` Ferenc Havasi
2005-01-05 11:24 ` Steven Scholz
2005-01-05 11:45 ` Artem B. Bityuckiy
2005-01-06 10:50 ` Ferenc Havasi
2005-01-10 15:14 ` Steven Scholz
2005-01-10 15:25 ` Steven Scholz
2005-01-11 8:26 ` Ferenc Havasi
2005-01-11 8:34 ` Steven Scholz
-- strict thread matches above, loose matches on Subject: below --
2004-10-20 14:26 Ferenc Havasi
2004-10-20 15:26 ` [OBORONA-SPAM] " Artem B. Bityuckiy
2004-10-20 15:49 ` Ferenc Havasi
2004-10-20 15:53 ` Artem B. Bityuckiy
2004-10-21 6:29 ` Artem B. Bityuckiy
2004-10-21 6:54 ` Ferenc Havasi
2004-10-21 7:16 ` Artem B. Bityuckiy
2004-10-21 19:50 ` Ferenc Havasi
2004-10-21 12:49 ` Jarkko Lavinen
2004-10-21 19:11 ` Ferenc Havasi
2004-10-22 9:58 ` Ferenc Havasi
2004-10-21 13:24 ` David Woodhouse
2004-10-21 20:05 ` Ferenc Havasi
2004-10-22 12:44 ` Artem Bityuckiy
2004-10-25 9:36 ` Ferenc Havasi
2004-10-25 10:56 ` Artem Bityuckiy
2004-10-25 15:30 ` Ferenc Havasi
2004-10-26 9:59 ` Artem Bityuckiy
2004-10-26 10:21 ` Ferenc Havasi
2004-10-26 11:05 ` Artem Bityuckiy
2004-10-26 13:52 ` Ferenc Havasi
2004-10-25 11:21 ` Artem Bityuckiy
2004-10-26 9:29 ` Jarkko Lavinen
2004-10-26 10:24 ` Ferenc Havasi
2004-10-26 10:34 ` Artem Bityuckiy
2004-12-15 23:19 Gareth Bult (Encryptec)
2004-12-16 0:15 ` Josh Boyer
2004-12-16 1:02 ` Gareth Bult (Encryptec)
2004-12-16 12:53 ` Josh Boyer
2004-12-16 21:22 ` Gareth Bult (Encryptec)
2004-12-16 21:28 ` Josh Boyer
2004-12-16 21:47 ` Gareth Bult (Encryptec)
2004-12-17 12:54 ` Josh Boyer
2004-12-17 15:33 ` Gareth Bult (Encryptec)
2004-12-17 16:02 ` Josh Boyer
2004-12-17 16:46 ` Gareth Bult (Encryptec)
2004-12-17 17:08 ` Artem B. Bityuckiy
2004-12-17 17:10 ` Josh Boyer
2004-12-17 17:26 ` Gareth Bult (Encryptec)
2004-12-17 17:35 ` Josh Boyer
2004-12-17 18:09 ` Gareth Bult (Encryptec)
2004-12-17 19:14 ` jasmine
2004-12-17 20:55 ` Gareth Bult (Encryptec)
2004-12-18 16:02 ` Jörn Engel
2004-12-20 16:34 ` Josh Boyer
2004-12-20 17:12 ` Gareth Bult (Encryptec)
2004-12-21 13:09 ` Jörn Engel
2004-12-21 13:24 ` Gareth Bult (Encryptec)
2004-12-21 13:34 ` Jörn Engel
2004-12-18 16:19 ` Jörn Engel
2004-12-18 17:32 ` Gareth Bult (Encryptec)
2004-12-18 17:52 ` Jörn Engel
2004-12-18 18:11 ` Jörn Engel
2004-12-18 20:48 ` Gareth Bult (Encryptec)
2004-12-19 2:44 ` Jörn Engel
2004-12-21 13:30 ` Jörn Engel
2004-12-21 13:40 ` Gareth Bult (Encryptec)
2004-12-21 15:00 ` David Woodhouse
[not found] ` <1103644945.10792.175.camel@squizzey.bult.co.uk>
2004-12-21 16:04 ` Jörn Engel
2004-12-16 13:43 ` Ferenc Havasi
2004-12-20 16:01 ` Gareth Bult (Encryptec)
2004-12-20 16:09 ` Ferenc Havasi
2004-12-20 16:39 ` Gareth Bult (Encryptec)
2004-12-20 17:48 ` Gareth Bult (Encryptec)
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