linux-kernel - Re: data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?!

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Date:	Wed, 13 Dec 2006 20:59:55 +0100 (CET)
From:	Karsten Weiss <K.Weiss@...ence-computing.de>
To:	Erik Andersen <andersen@...epoet.org>
Cc:	Christoph Anton Mitterer <calestyo@...entia.net>,
	linux-kernel@...r.kernel.org, Chris Wedgwood <cw@...f.org>
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives //
 memory hole mapping related bug?!

On Wed, 13 Dec 2006, Erik Andersen wrote:

> On Mon Dec 11, 2006 at 10:24:02AM +0100, Karsten Weiss wrote:
> > Last week we did some more testing with the following result:
> > 
> > We could not reproduce the data corruption anymore if we boot the machines 
> > with the kernel parameter "iommu=soft" i.e. if we use software bounce 
> > buffering instead of the hw-iommu. (As mentioned before, booting with 
> > mem=2g works fine, too, because this disables the iommu altogether.)
> > 
> > I.e. on these systems the data corruption only happens if the hw-iommu 
> > (PCI-GART) of the Opteron CPUs is in use.
> > 
> > Christoph, Erik, Chris: I would appreciate if you would test and hopefully 
> > confirm this workaround, too.
> 
> What did you set the BIOS to when testing this setting?
> Memory Hole enabled?  IOMMU enabled?

"Memory hole mapping" was set to "hardware". With "disabled" we only
see 3 of our 4 GB memory.

Best regards,
Karsten

-- 
__________________________________________creating IT solutions
Dipl.-Inf. Karsten Weiss               science + computing ag
phone:    +49 7071 9457 452            Hagellocher Weg 73
teamline: +49 7071 9457 681            72070 Tuebingen, Germany
email:    knweiss@...ence-computing.de www.science-computing.de

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