Date: Tue, 09 Nov 2004 07:43:56 -0800
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Jake Moilanen <moilanen@austin.ibm.com>,
       Leo Przybylski <leo@leosandbox.org>
cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Blast and data miscompare
Message-ID: <277580000.1100015035@[10.10.2.4]>
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--Jake Moilanen <moilanen@austin.ibm.com> wrote (on Tuesday, November 09, 2004 09:34:00 -0600):

>> I have tried searching on this issue, but found nothing. I heard from a 
>> kernel developer at work that a memory error was discovered recently in 
>> the linux 2.6 kernel that causes data miscompare errors in the generic 
>> scsi driver when executing blast tests.
>> 
>> Does anyone know more about this???
> 
> Not sure if it's the same problem.  But we were seeing a miscompare on
> 2.4 due to a incorrect COW happening, followed by a hardware hash hole
> w/ PPC64.
> 
> To fix it we had to make sure that the PTE was cleared and the TLB's
> flushed before the new PTE was established.
> 
> Martin, was this fixed on 2.6?

Yup, was already fixed in 2.6, and is PPC64 only. Most of those errors
tend to be caused by IO problems ...

M.

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