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

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Date:	Fri, 19 Jan 2007 09:49:47 +1100
From:	Andi Kleen <ak@...e.de>
To:	Chip Coldwell <coldwell@...hat.com>
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 Friday 19 January 2007 08:57, Chip Coldwell wrote:

> 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.

I suspect it would disturb timing so badly that it might hide the original
problem. If that is true then adding udelays might hide it too. 

Ok i guess you could test with a UP kernel. There change_page_attr
should be much cheaper because it doesn't need to IPI to other CPUs. Also use 
a .2.6.20-rc* kernel that uses CLFLUSH in there, not WBINVD which is also
very costly.

Anyways I guess we can just wait what the hardware people figure out.

-Andi
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