From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>, linux-kernel@vger.kernel.org
Subject: Re: Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately?
Date: Fri, 1 Jun 2007 14:41:57 -0700 [thread overview]
Message-ID: <200706011441.57149.jbarnes@virtuousgeek.org> (raw)
In-Reply-To: <20070601211943.GO7217@one.firstfloor.org>
On Friday, June 1, 2007 2:19:43 Andi Kleen wrote:
> And normally the MTRRs win, don't they (if I remember the table correctly)
> So if the MTRR says UC and PAT disagrees it might not actually help
I just checked, yes the MTRRs win for UC types. But it sounds like the cases
we're talking about are actually situations where there's no MTRR coverage,
so the default type is used. The manual doesn't specifically call out how
memory using the default type interacts with PAT, but it may well be that it
stays uncached if the default type is uncached. Again that argues for fixing
the MTRR mapping problem in some way.
Thanks,
Jesse
next prev parent reply other threads:[~2007-06-01 21:42 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-01 18:14 Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately? Justin Piszcz
2007-06-01 19:10 ` Jesse Barnes
2007-06-01 19:17 ` Justin Piszcz
2007-06-01 19:19 ` Justin Piszcz
2007-06-01 19:21 ` Jesse Barnes
2007-06-01 21:14 ` Andi Kleen
2007-06-01 20:19 ` Justin Piszcz
2007-06-01 20:24 ` Andi Kleen
2007-06-01 20:26 ` Justin Piszcz
2007-06-01 21:07 ` Jesse Barnes
2007-06-01 21:19 ` Andi Kleen
2007-06-01 21:35 ` Jesse Barnes
2007-06-01 21:41 ` Jesse Barnes [this message]
2007-06-02 1:05 ` Venki Pallipadi
2007-06-02 1:15 ` Jesse Barnes
2007-06-02 8:43 ` Justin Piszcz
2007-06-02 9:22 ` Andi Kleen
2007-06-02 20:11 ` Justin Piszcz
2007-06-03 9:15 ` Matt Keenan
2007-06-04 15:40 ` Jesse Barnes
2007-06-04 15:48 ` Ray Lee
2007-06-04 15:49 ` Justin Piszcz
2007-06-04 16:01 ` Ray Lee
2007-06-04 15:54 ` Jesse Barnes
2007-06-04 18:24 ` Andi Kleen
2007-06-04 18:13 ` Eric W. Biederman
2007-06-04 18:22 ` Justin Piszcz
2007-06-04 19:08 ` Justin Piszcz
2007-06-04 19:17 ` Jesse Barnes
2007-06-04 19:18 ` Alan Cox
2007-06-04 21:01 ` Eric W. Biederman
2007-06-05 0:59 ` Yinghai Lu
2007-06-05 1:38 ` Eric W. Biederman
2007-06-05 9:46 ` Andi Kleen
2007-06-05 13:18 ` Justin Piszcz
2007-06-05 17:20 ` Jesse Barnes
2007-06-07 8:47 ` Andi Kleen
2007-06-04 19:23 ` Andi Kleen
2007-06-04 19:24 ` Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately? II Andi Kleen
2007-06-05 0:54 ` Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately? Yinghai Lu
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