From: Russell King <rmk@arm.linux.org.uk>
To: Jamie Lokier <jamie@shareable.org>
Cc: "Paul J.Y. Lahaie" <pjlahaie@steamballoon.com>,
linux-kernel@vger.kernel.org
Subject: Re: x86, ARM, PARISC, PPC, MIPS and Sparc folks please run this
Date: Tue, 2 Sep 2003 19:52:22 +0100 [thread overview]
Message-ID: <20030902195222.D9345@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20030902115731.GA14354@mail.jlokier.co.uk>; from jamie@shareable.org on Tue, Sep 02, 2003 at 12:57:31PM +0100
On Tue, Sep 02, 2003 at 12:57:31PM +0100, Jamie Lokier wrote:
> You say that "reading from the first mapping _should_ return the
> second write value no matter what", but that there's a bug in the
> write buffer and it isn't doing that.
>
> I'm saying that the bug can't be that, because such a bug would affect
> normal applications.
I know of no other explaination which fits with the information I have
available to me here. If you'd care to speculate further, you may,
but I see further speculation as being rather academic, unless it comes
from one of the people who designed the chip.
All this is, however, immateral - the facts are that the write buffer
is buggy, this test detects it, and we can take fairly easy measures
to ensure we fix it up.
Multiple mappings of the same object rarely occur in my experience, so
the resulting performance loss caused by working around the cache and
writebuffer is something we can live with.
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html
next prev parent reply other threads:[~2003-09-02 18:52 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-29 5:35 x86, ARM, PARISC, PPC, MIPS and Sparc folks please run this Jamie Lokier
2003-08-29 10:03 ` J.A. Magallon
2003-08-29 10:36 ` Alan Cox
2003-09-01 4:49 ` Jamie Lokier
2003-08-29 10:04 ` Sergey S. Kostyliov
2003-08-29 10:15 ` J.A. Magallon
2003-08-29 10:21 ` J.A. Magallon
2003-08-29 10:34 ` CaT
2003-08-29 10:37 ` CaT
2003-08-29 10:49 ` Mikael Pettersson
2003-08-29 11:41 ` Gianni Tedesco
2003-08-29 11:51 ` James Morris
2003-08-29 15:41 ` Larry McVoy
2003-08-29 23:05 ` Mike Fedyk
2003-08-31 5:10 ` David S. Miller
2003-08-31 22:49 ` Jamie Lokier
2003-09-01 5:31 ` David S. Miller
2003-09-01 6:42 ` Jamie Lokier
2003-09-01 7:06 ` David S. Miller
2003-09-01 8:29 ` Jamie Lokier
2003-09-01 9:02 ` David S. Miller
2003-09-01 10:04 ` Jamie Lokier
2003-09-01 10:02 ` David S. Miller
2003-09-03 17:36 ` bill davidsen
2003-09-04 22:50 ` Jamie Lokier
2003-09-01 5:44 ` Jamie Lokier
2003-09-01 14:43 ` Larry McVoy
2003-09-01 16:33 ` Jamie Lokier
2003-09-01 16:58 ` Larry McVoy
2003-09-02 20:29 ` Jamie Lokier
2003-08-29 15:47 ` Herbert Poetzl
2003-08-30 1:48 ` Stuart Longland
2003-08-29 16:27 ` Geert Uytterhoeven
2003-09-01 5:58 ` Jamie Lokier
2003-09-01 8:34 ` Geert Uytterhoeven
2003-09-01 9:09 ` Kars de Jong
2003-09-01 10:08 ` Jamie Lokier
2003-09-01 11:13 ` Roman Zippel
2003-09-02 20:42 ` Kars de Jong
2003-09-02 21:39 ` Jamie Lokier
2003-09-03 7:59 ` Geert Uytterhoeven
2003-09-03 9:13 ` Jamie Lokier
2003-09-03 9:26 ` Geert Uytterhoeven
2003-09-03 12:17 ` Roman Zippel
2003-09-03 12:36 ` Geert Uytterhoeven
2003-09-03 13:29 ` Jamie Lokier
2003-09-03 16:07 ` Nagendra Singh Tomar
2003-09-04 5:03 ` Davide Libenzi
2003-09-03 18:03 ` Nagendra Singh Tomar
2003-09-04 6:38 ` Davide Libenzi
2003-09-04 11:19 ` Alan Cox
2003-09-05 21:24 ` Pavel Machek
2003-09-06 23:09 ` Jamie Lokier
2003-09-07 13:10 ` Pavel Machek
2003-09-07 13:35 ` Jamie Lokier
2003-09-07 13:40 ` Pavel Machek
2003-09-07 13:53 ` Jamie Lokier
2003-09-07 17:56 ` Alan Cox
2003-09-03 12:13 ` Jan-Benedict Glaw
2003-09-01 10:35 ` Sam Creasey
2003-09-01 10:48 ` Jamie Lokier
2003-09-01 12:23 ` Sam Creasey
2003-09-03 8:00 ` Kars de Jong
2003-09-03 8:05 ` Geert Uytterhoeven
2003-09-03 9:24 ` Kars de Jong
2003-08-29 16:31 ` Brian Jackson
2003-08-29 17:39 ` Matt Porter
2003-09-01 6:00 ` Jamie Lokier
2003-09-01 11:17 ` Alan Cox
2003-09-01 17:22 ` Roland Dreier
2003-09-02 2:16 ` Matt Porter
2003-09-02 5:40 ` Jamie Lokier
2003-08-29 19:37 ` Thorsten Kranzkowski
2003-08-29 20:03 ` Sean Neakums
2003-08-29 20:14 ` Iulian Musat
2003-08-29 20:26 ` Paul J.Y. Lahaie
2003-09-01 8:15 ` Russell King
2003-09-01 10:12 ` Jamie Lokier
2003-09-01 11:30 ` Geert Uytterhoeven
2003-09-01 14:17 ` Russell King
2003-09-01 14:51 ` Russell King
2003-09-01 19:09 ` Guennadi Liakhovetski
2003-09-01 16:52 ` Jamie Lokier
2003-09-01 17:11 ` Russell King
2003-09-02 5:34 ` Jamie Lokier
2003-09-02 8:15 ` Russell King
2003-09-02 11:57 ` Jamie Lokier
2003-09-02 18:52 ` Russell King [this message]
2003-09-02 23:59 ` Larry McVoy
2003-09-03 7:31 ` Russell King
2003-09-03 7:41 ` Jamie Lokier
2003-09-03 18:05 ` Russell King
2003-09-04 22:20 ` Jamie Lokier
2003-09-04 17:37 ` Maciej W. Rozycki
2003-08-29 22:35 ` Kenneth Johansson
2003-08-29 23:47 ` Kurt Wall
2003-09-01 0:24 ` Paul Mundt
2003-09-01 0:37 ` Jamie Lokier
2003-09-01 1:00 ` Paul Mundt
2003-09-01 1:58 ` Jamie Lokier
2003-09-01 1:13 ` dean gaudet
2003-09-01 4:29 ` Jamie Lokier
2003-09-02 10:08 ` Jan Rychter
[not found] <20030829053510.GA12663@mail.jlokier.co.uk.suse.lists.linux.kernel>
2003-08-29 11:08 ` Andi Kleen
2003-08-29 11:17 ` Russell King
2003-09-01 5:03 ` Jamie Lokier
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