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 20:56:18 +0100 (CET)
From:	Karsten Weiss <knweiss@....de>
To:	Christoph Anton Mitterer <calestyo@...entia.net>
cc:	linux-kernel@...r.kernel.org, ak@...e.de, andersen@...epoet.org,
	cw@...f.org
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives //
 memory hole mapping related bug?!

On Wed, 13 Dec 2006, Christoph Anton Mitterer wrote:

>> Christoph, I will carefully re-read your entire posting and the
>> included links on Monday and will also try the memory hole
>> setting.
>>
> And did you get out anything new?

As I already mentioned the kernel parameter "iommu=soft" fixes
the data corruption for me. We saw no more data corruption
during a test on 48 machines over the last week-end. Chris
Wedgewood already confirmed that this setting fixed the data
corruption for him, too.

Of course, the big question "Why does the hardware iommu *not*
work on those machines?" still remains.

I have also tried setting "memory hole mapping" to "disabled"
instead of "hardware" on some of the machines and this *seems*
to work stable, too. However, I did only test it on about a
dozen machines because this bios setting costs us 1 GB memory
(and iommu=soft does not).

BTW: Maybe I should also mention that other machines types
(e.g. the HP xw9300 dual opteron workstations) which also use a
NVIDIA chipset and Opterons never had this problem as far as I
know.

Best regards,
Karsten

-- 
Dipl.-Inf. Karsten Weiss - http://www.machineroom.de/knweiss
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