linux-kernel - Re: data corruption with nvidia chipsets and IDE/SATA drives (k8 cpu errata needed?)

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Date:	Thu, 18 Jan 2007 16:57:22 -0500 (EST)
From:	Chip Coldwell <coldwell@...hat.com>
To:	Andi Kleen <ak@...e.de>
cc:	Chris Wedgwood <cw@...f.org>,
	Christoph Anton Mitterer <calestyo@...entia.net>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel@...r.kernel.org, knweiss@....de,
	andersen@...epoet.org, krader@...ibm.com, lfriedman@...dia.com,
	linux-nforce-bugs@...dia.com
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives (k8
 cpu errata needed?)

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

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