From: Chip Coldwell <coldwell@redhat.com>
To: Andi Kleen <ak@suse.de>
Cc: Chris Wedgwood <cw@f00f.org>,
Christoph Anton Mitterer <calestyo@scientia.net>,
Robert Hancock <hancockr@shaw.ca>,
linux-kernel@vger.kernel.org, knweiss@gmx.de,
andersen@codepoet.org, krader@us.ibm.com, lfriedman@nvidia.com,
linux-nforce-bugs@nvidia.com
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives (k8 cpu errata needed?)
Date: Thu, 18 Jan 2007 16:57:22 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.64.0701181655300.13116@localhost.localdomain> (raw)
In-Reply-To: <200701180915.32944.ak@suse.de>
On Thu, 18 Jan 2007, Andi Kleen wrote:
>
> The Northbridge guarantees coherency over the aperture, but
> only if the caching attributes match.
That's interesting. Makes sense, I suppose.
> You would need to change_page_attr() every kernel address that is mapped into
> the IOMMU to use an uncached aperture. AGP does this, but the frequency of
> mapping for the IOMMU is much higher and it would be prohibitively costly
> unfortunately.
But it still might be a reasonable thing to do to test the theory that
the problem is cache coherency across the graphics aperture, even if
it isn't a long-term solution for the problem.
> In the past we saw corruptions from such conflicts, so this is more
> than just theory. I suspect you traded a more easy to trigger
> corruption with a more subtle one.
Yup. That was the inspiration for the script.
Chip
--
Charles M. "Chip" Coldwell
Senior Software Engineer
Red Hat, Inc
978-392-2426
next prev parent reply other threads:[~2007-01-18 22:00 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.E9jVXDLMKzMZNCbslzUxjMhsInE@ifi.uio.no>
2007-01-03 23:41 ` data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?! Robert Hancock
2007-01-15 22:56 ` Christoph Anton Mitterer
2007-01-15 23:05 ` Christoph Anton Mitterer
2007-01-16 0:23 ` Robert Hancock
2007-01-16 13:54 ` Christoph Anton Mitterer
2007-01-16 14:26 ` Robert Hancock
2007-01-16 18:01 ` data corruption with nvidia chipsets and IDE/SATA drives (k8 cpu errata needed?) Chris Wedgwood
2007-01-16 19:52 ` Christoph Anton Mitterer
2007-01-16 20:31 ` Chris Wedgwood
2007-01-16 21:29 ` Andi Kleen
2007-01-17 1:17 ` Christoph Anton Mitterer
2007-01-17 14:48 ` Chip Coldwell
2007-01-17 19:46 ` Chip Coldwell
2007-01-17 22:15 ` Andi Kleen
2007-01-18 21:57 ` Chip Coldwell [this message]
2007-01-18 22:49 ` Andi Kleen
2007-01-18 9:29 ` joachim
2007-01-18 14:34 ` Christoph Anton Mitterer
2007-01-18 16:42 ` Chris Wedgwood
2007-01-18 11:00 ` Erik Andersen
2007-01-18 14:43 ` Christoph Anton Mitterer
2007-01-18 16:36 ` Chris Wedgwood
2007-01-18 23:23 ` Andi Kleen
2007-02-21 17:03 ` Chip Coldwell
2007-01-16 21:54 ` Allen Martin
2007-01-17 1:12 ` Christoph Anton Mitterer
2007-01-16 20:16 ` Arkadiusz Miskiewicz
2007-01-16 20:21 ` Christoph Anton Mitterer
2007-01-16 20:31 ` Krzysztof Halasa
2007-01-16 20:35 ` Chris Wedgwood
2007-03-22 12:32 ` data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?! Christoph Anton Mitterer
[not found] <fa.Tb2r8Il/2H8l9dhmsGAAQB2WEZg@ifi.uio.no>
[not found] ` <fa.MydhQJqKsehLS9lIc2JSZC8Q77A@ifi.uio.no>
[not found] ` <fa.M9SCVAz1qZ6vrR9HTrRb95KdBSY@ifi.uio.no>
[not found] ` <fa.5WKg4jbSxjbUXedux14VStNyV+8@ifi.uio.no>
[not found] ` <fa.lphwLNvMksoBFaqfqCzMG1UVhsA@ifi.uio.no>
2007-03-05 6:25 ` data corruption with nvidia chipsets and IDE/SATA drives (k8 cpu errata needed?) Robert Hancock
2007-03-12 13:06 ` Andi Kleen
2007-03-12 14:56 ` Jeff Garzik
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