From: Andi Kleen <andi@firstfloor.org>
To: Helge Hafting <helge.hafting@aitel.hist.no>
Cc: Jesse Barnes <jesse.barnes@intel.com>,
Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org,
Justin Piszcz <jpiszcz@lucidpixels.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH] trim memory not covered by WB MTRRs
Date: Wed, 20 Jun 2007 16:37:40 +0200 [thread overview]
Message-ID: <20070620143740.GA17161@one.firstfloor.org> (raw)
In-Reply-To: <46790DFA.5090503@aitel.hist.no>
> I assume this cannot be fixed by the simple approach
> of echoing some useful numbers into /proc/mtrr like
> we used to do for video memory? (Before X did this
> automatically?)
>
> An extra bootscript seems better than loosing memory.
In some cases it probably can, in other cases not because the memory
controller is misconfigured or not the right bits are set
in the PCI bridges to enable DAC IO or ... or ...
There are also definite limits on how much quirks can do
to fix this -- Linux is a generic kernel, not a BIOS replacement,
and can never be as intimate with the current setup
as the BIOS is.
It's definitely far safer to not use the memory. You're
running in a situation never tested or considered by the
motherboard vendor and everything is possible.
-Andi
next prev parent reply other threads:[~2007-06-20 14:37 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-06 19:29 [PATCH] trim memory not covered by WB MTRRs Jesse Barnes
2007-06-06 20:26 ` Justin Piszcz
2007-06-06 20:28 ` Jesse Barnes
2007-06-06 20:31 ` Jesse Barnes
2007-06-06 20:37 ` Justin Piszcz
2007-06-06 20:50 ` Jesse Barnes
2007-06-06 21:26 ` Justin Piszcz
2007-06-06 21:53 ` Justin Piszcz
2007-06-06 22:03 ` Justin Piszcz
2007-06-06 22:05 ` Jesse Barnes
2007-06-06 22:07 ` Justin Piszcz
2007-06-06 22:13 ` Justin Piszcz
2007-06-06 22:24 ` Jesse Barnes
2007-06-06 22:26 ` Justin Piszcz
2007-06-06 22:28 ` Jesse Barnes
2007-06-06 22:31 ` Justin Piszcz
2007-06-06 22:35 ` Justin Piszcz
2007-06-06 22:37 ` Randy Dunlap
2007-06-06 22:46 ` Justin Piszcz
2007-06-06 22:54 ` Justin Piszcz
2007-06-06 23:11 ` Randy Dunlap
2007-06-06 23:15 ` Justin Piszcz
2007-06-06 23:34 ` Jesse Barnes
2007-06-07 8:10 ` Justin Piszcz
2007-06-06 22:39 ` Justin Piszcz
2007-06-06 22:57 ` Justin Piszcz
2007-06-06 23:20 ` Jesse Barnes
2007-06-06 23:24 ` Justin Piszcz
2007-06-06 23:27 ` Jesse Barnes
2007-06-07 8:51 ` Andi Kleen
2007-06-07 8:53 ` Justin Piszcz
2007-06-07 9:55 ` Satyam Sharma
2007-06-07 17:33 ` Jesse Barnes
2007-06-07 7:45 ` Eric W. Biederman
2007-06-07 17:30 ` Jesse Barnes
2007-06-08 23:13 ` Eric W. Biederman
2007-06-12 15:39 ` Jesse Barnes
2007-06-07 8:16 ` Andi Kleen
2007-06-07 17:35 ` Jesse Barnes
2007-06-07 17:40 ` Justin Piszcz
2007-06-07 14:41 ` Pavel Machek
2007-06-08 0:20 ` Andrew Morton
2007-06-08 1:33 ` Jesse Barnes
2007-06-08 21:15 ` Andrew Morton
2007-06-08 21:28 ` Jesse Barnes
2007-06-13 1:11 ` Eric W. Biederman
2007-06-13 2:29 ` Jesse Barnes
2007-06-13 22:19 ` Eric W. Biederman
2007-06-20 11:22 ` Helge Hafting
2007-06-20 14:37 ` Andi Kleen [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-06-07 22:30 Jesse Barnes
2007-06-07 22:50 ` Justin Piszcz
2007-06-07 22:53 ` Justin Piszcz
2007-06-07 23:00 ` Justin Piszcz
2007-06-08 8:20 ` Justin Piszcz
2007-06-12 14:50 ` Pavel Machek
2007-06-12 15:29 ` Jesse Barnes
2007-06-12 15:48 ` Andi Kleen
2007-06-12 21:30 ` Pavel Machek
2007-06-12 21:31 ` Justin Piszcz
2007-06-12 21:38 ` Ray Lee
2007-06-12 21:55 ` Pavel Machek
2007-06-13 0:25 ` Ray Lee
2007-06-13 8:22 ` Pavel Machek
2007-06-14 19:38 ` Pim Zandbergen
2007-06-14 20:26 ` Justin Piszcz
2007-06-14 21:18 ` Jesse Barnes
2007-06-14 21:21 ` Justin Piszcz
2007-06-14 21:26 ` Jesse Barnes
2007-06-15 10:21 ` Pim Zandbergen
2007-06-15 16:20 ` Jesse Barnes
2007-06-21 14:24 ` Pim Zandbergen
2007-06-21 14:28 ` Justin Piszcz
2007-06-25 16:31 ` Pim Zandbergen
2007-06-25 16:34 ` Justin Piszcz
2007-06-15 10:17 ` Pim Zandbergen
2007-06-15 10:34 ` Justin Piszcz
2007-06-15 17:28 ` Jesse Barnes
2007-06-20 13:55 ` Pim Zandbergen
2007-06-21 19:40 ` Yinghai Lu
2007-06-21 19:56 ` Jesse Barnes
[not found] <fa.i7vJP3lxWAlyOLjcsqOWPKlixD8@ifi.uio.no>
[not found] ` <fa.3ijVoClbWNHWrMhDABWjNPxp+wo@ifi.uio.no>
[not found] ` <fa.ZqgSvRGj/scOmd0AwnU6e21Gcwc@ifi.uio.no>
[not found] ` <fa.oNsjw768fkDpx3oef91fjAQs1Iw@ifi.uio.no>
[not found] ` <fa.x8ZCt4n0yXI1llhRq4wfjNfqK4w@ifi.uio.no>
2007-06-08 1:57 ` Robert Hancock
[not found] <8tyOc-8f0-17@gated-at.bofh.it>
2007-06-13 6:52 ` Bodo Eggert
2007-06-13 16:19 ` Dave Jones
2007-06-25 21:34 Jesse Barnes
2007-06-25 21:45 ` Justin Piszcz
2007-06-25 22:01 ` Andrew Morton
2007-06-25 22:05 ` Jesse Barnes
2007-06-25 22:29 ` Justin Piszcz
2007-06-25 23:34 ` Andi Kleen
2007-06-25 23:36 ` Jesse Barnes
2007-06-26 0:54 ` Eric W. Biederman
2007-06-26 3:29 ` Jesse Barnes
2007-06-26 3:30 ` Jesse Barnes
2007-06-26 15:03 ` Andi Kleen
2007-06-26 15:07 ` Jesse Barnes
2007-06-26 15:18 ` Jesse Barnes
2007-06-26 15:39 ` Andi Kleen
2007-06-26 15:54 ` Yinghai Lu
2007-06-26 16:06 ` Eric W. Biederman
2007-06-26 17:38 ` Andi Kleen
2007-06-26 18:55 ` Yinghai Lu
2007-06-26 15:02 ` Andi Kleen
2007-06-26 15:38 ` Jesse Barnes
2007-06-27 10:44 ` Pim Zandbergen
2007-06-27 11:22 ` Andi Kleen
2007-06-27 11:40 ` Pim Zandbergen
2007-06-27 11:44 ` Justin Piszcz
2007-06-27 14:22 ` Mauro Giachero
2007-06-27 15:04 ` Jesse Barnes
2007-06-27 16:00 ` Pim Zandbergen
2007-06-27 16:07 ` Jesse Barnes
2007-06-27 16:22 ` Jesse Barnes
2007-06-27 17:02 ` Pim Zandbergen
2007-06-27 17:06 ` Jesse Barnes
2007-06-27 17:17 ` Pim Zandbergen
2007-07-05 12:12 ` Pavel Machek
2007-07-05 12:16 ` Justin Piszcz
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