From: David Woodhouse <dwmw2@infradead.org>
To: Wojciech Kromer <krom@dgt-lab.com.pl>
Cc: mtd <linux-mtd@lists.infradead.org>
Subject: Re: JFFS2 on 8MB Flash-Chip conneted to MPC850 works extremly slow:(
Date: Wed, 29 Aug 2001 10:24:57 +0100 [thread overview]
Message-ID: <25302.999077097@redhat.com> (raw)
In-Reply-To: <3B8CB316.4A421C81@dgt-lab.com.pl>
krom@dgt-lab.com.pl said:
> > The erase of unclean sectors is done in the background after the mount
> > has finished. One day we'll get round to fixing the drivers so that we
> > don't busy-wait for erases to complete either.
> Please anonuce it on the list.
It won't make your mount any faster. You have a sane CPU which can handle
having both a cached and uncached mapping of a physical region - try doing
that in your map driver (see ocelot.c for inspiration) and see if it helps.
You may also want to investigate burst reads from the flash chips, if your
hardware is capable of it.
Another possibility is to work with the people who want XIP so you can give
the JFFS2 code a direct pointer to the flash chips and avoid the
out-of-line function calls on every read.
--
dwmw2
next prev parent reply other threads:[~2001-08-29 9:18 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-28 11:59 JFFS2 on 8MB Flash-Chip conneted to MPC850 works extremly slow :( Wojciech Kromer
2001-08-28 15:53 ` Russ Dill
2001-08-29 6:07 ` Wojciech Kromer
2001-08-29 7:17 ` Russ Dill
2001-08-29 7:46 ` JFFS2 on 8MB Flash-Chip conneted to MPC850 works extremly slow:( Wojciech Kromer
2001-08-29 8:36 ` Russ Dill
2001-08-29 8:55 ` David Woodhouse
2001-08-29 9:17 ` Wojciech Kromer
2001-08-29 9:24 ` David Woodhouse [this message]
2001-08-29 10:15 ` Joakim Tjernlund
2001-08-29 10:19 ` David Woodhouse
2001-09-03 12:19 ` Wojciech Kromer
2001-09-03 12:26 ` David Woodhouse
[not found] ` <4189.999520431@redhat.com>
2001-09-03 12:42 ` Wojciech Kromer
2001-09-05 8:19 ` Wojciech Kromer
2001-09-05 8:29 ` David Woodhouse
-- strict thread matches above, loose matches on Subject: below --
2001-09-06 14:29 JFFS2 on 8MB Flash-Chip conneted to MPC850 works extremly slo w:( Jonas Holmberg
2001-09-07 7:33 ` JFFS2 on 8MB Flash-Chip conneted to MPC850 works extremly slow:( Wojciech Kromer
2001-09-07 8:10 ` David Woodhouse
2001-09-07 8:33 ` Wojciech Kromer
2001-09-07 13:26 ` Wojciech Kromer
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