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From: Robert Hancock <hancockr@shaw.ca>
To: Christoph Anton Mitterer <calestyo@scientia.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?!
Date: Wed, 03 Jan 2007 17:41:29 -0600	[thread overview]
Message-ID: <459C3F29.2@shaw.ca> (raw)
In-Reply-To: <fa.E9jVXDLMKzMZNCbslzUxjMhsInE@ifi.uio.no>

Christoph Anton Mitterer wrote:
> Hi.
> 
> Perhaps some of you have read my older two threads:
> http://marc.theaimsgroup.com/?t=116312440000001&r=1&w=2 and the even
> older http://marc.theaimsgroup.com/?t=116291314500001&r=1&w=2
> 
> The issue was basically the following:
> I found a severe bug mainly by fortune because it occurs very rarely.
> My test looks like the following: I have about 30GB of testing data on
> my harddisk,... I repeat verifying sha512 sums on these files and check
> if errors occur.
> One test pass verifies the 30GB 50 times,... about one to four
> differences are found in each pass.
> 
> The corrupted data is not one single completely wrong block of data or
> so,.. but if you look at the area of the file where differences are
> found,.. than some bytes are ok,.. some are wrong,.. and so on (seems to
> be randomly).
> 
> Also, there seems to be no event that triggers the corruption,.. it
> seems to be randomly, too.
> 
> It is really definitely not a harware issue (see my old threads my
> emails to Tyan/Hitachi and my "workaround" below. My system isn't
> overclocked.
> 
> 
> 
> My System:
> Mainboard: Tyan S2895
> Chipsets: Nvidia nforce professional 2200 and 2050 and AMD 8131
> CPU: 2x DualCore Opterons model 275
> RAM: 4GB Kingston Registered/ECC
> Diskdrives: IBM/Hitachi: 1 PATA, 2 SATA
> 
> 
> The data corruption error occurs on all drives.
> 
> 
> You might have a look at the emails between me and Tyan and Hitachi,..
> they contain probalby lots of valuable information (especially my
> different tests).
> 
> 
> 
> Some days ago,.. an engineer of Tyan suggested me to boot the kernel
> with mem=3072M.
> When doing this,.. the issue did not occur (I don't want to say it was
> solved. Why? See my last emails to Tyan!)
> Then he suggested me to disable the memory hole mapping in the BIOS,...
> When doing so,.. the error doesn't occur, too.
> But I loose about 2GB RAM,.. and,.. more important,.. I cant believe
> that this is responsible for the whole issue. I don't consider it a
> solution but more a poor workaround which perhaps only by fortune solves
> the issue (Why? See my last eMails to Tyan ;) )
> 
> 
> 
> So I'd like to ask you if you perhaps could read the current information
> in this and previous mails,.. and tell me your opinions.
> It is very likely that a large number of users suffer from this error
> (namely all Nvidia chipset users) but only few (there are some,.. I
> found most of them in the Nvidia forums,.. and they have exactly the
> same issue) identify this as an error because it's so rare.
> 
> Perhaps someone have an idea why disabling the memhole mapping solves
> it. I've always thought that memhole mapping just moves some address
> space to higher addreses to avoid the conflict between address space for
> PCI devices and address space for pyhsical memory.
> But this should be just a simple addition and not solve this obviously
> complex error.

If this is related to some problem with using the GART IOMMU with memory 
hole remapping enabled, then 2.6.20-rc kernels may avoid this problem on 
nForce4 CK804/MCP04 chipsets as far as transfers to/from the SATA 
controller are concerned as the sata_nv driver now supports 64-bit DMA 
on these chipsets and so no longer requires the IOMMU.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/


       reply	other threads:[~2007-01-03 23:42 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.E9jVXDLMKzMZNCbslzUxjMhsInE@ifi.uio.no>
2007-01-03 23:41 ` Robert Hancock [this message]
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
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
2007-03-22 14:48 Dan Halbert
  -- strict thread matches above, loose matches on Subject: below --
2006-12-15 15:57 Paul Slootman
     [not found] <Pine.LNX.4.64.0612021202000.2981@addx.localnet>
2006-12-11  9:24 ` Karsten Weiss
2006-12-13 19:18   ` Christoph Anton Mitterer
2006-12-13 19:53     ` Chris Wedgwood
2006-12-13 20:34       ` Karsten Weiss
2006-12-14  9:22         ` Muli Ben-Yehuda
2006-12-23  2:04         ` Christoph Anton Mitterer
2006-12-23  2:56           ` John A Chaves
2006-12-23  3:26             ` Christoph Anton Mitterer
2006-12-13 19:20   ` Christoph Anton Mitterer
2006-12-13 19:54     ` Chris Wedgwood
2006-12-13 19:57       ` Christoph Anton Mitterer
2006-12-13 22:39         ` Lennart Sorensen
2006-12-13 23:00           ` Christoph Anton Mitterer
2006-12-13 19:53   ` Erik Andersen
2006-12-13 19:59     ` Karsten Weiss
2006-12-13 20:02       ` Christoph Anton Mitterer
2006-12-13 20:29   ` Erik Andersen
2006-12-13 20:32     ` Christoph Anton Mitterer
2006-12-13 23:33     ` Christoph Anton Mitterer
2006-12-14  9:24       ` Muli Ben-Yehuda
2006-12-14 19:23         ` Christoph Anton Mitterer
2006-12-14  9:23     ` Muli Ben-Yehuda
2006-12-14  9:52       ` Erik Andersen
2006-12-14  9:56         ` Muli Ben-Yehuda
2007-01-03 15:02     ` Christoph Anton Mitterer
2007-01-04 13:04     ` Christoph Anton Mitterer
2006-12-02  0:56 Christoph Anton Mitterer
2006-12-02  1:15 ` Erik Andersen
2006-12-02  1:28   ` Christoph Anton Mitterer
2006-12-02  5:17 ` Chris Wedgwood
2006-12-02 12:10   ` Christoph Anton Mitterer
     [not found]   ` <20061202111644.GF9995@vianova.fi>
2006-12-08  2:16     ` Christoph Anton Mitterer
2006-12-02 11:00 ` Karsten Weiss
2006-12-02 11:37   ` Alan
2006-12-02 11:39     ` Christoph Anton Mitterer
2006-12-13 18:52   ` Christoph Anton Mitterer
2006-12-13 19:56     ` Karsten Weiss
2006-12-13 20:11       ` Christoph Anton Mitterer
2006-12-14  9:34         ` Chris Wedgwood
2007-01-15 22:26           ` Christoph Anton Mitterer
2006-12-14 23:39 ` Dax Kelson

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