Date: Thu, 14 Dec 2006 11:23:11 +0200
From: Muli Ben-Yehuda <muli@il.ibm.com>
To: Erik Andersen <andersen@codepoet.org>
Cc: Karsten Weiss <K.Weiss@science-computing.de>,
       Christoph Anton Mitterer <calestyo@scientia.net>,
       linux-kernel@vger.kernel.org, Chris Wedgwood <cw@f00f.org>
Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?!
Message-ID: <20061214092311.GC6674@rhun.haifa.ibm.com>
References: <Pine.LNX.4.64.0612021202000.2981@addx.localnet> <Pine.LNX.4.61.0612111001240.23470@palpatine.science-computing.de> <20061213202925.GA3909@codepoet.org>
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On Wed, Dec 13, 2006 at 01:29:25PM -0700, Erik Andersen wrote:
> On Mon Dec 11, 2006 at 10:24:02AM +0100, Karsten Weiss wrote:
> > 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.
> 
> I just realized that booting with "iommu=soft" makes my pcHDTV
> HD5500 DVB cards not work.  Time to go back to disabling the
> memhole and losing 1 GB.  :-(

That points to a bug in the driver (likely) or swiotlb (unlikely), as
the IOMMU in use should be transparent to the driver. Which driver is
it?

Cheers,
Muli
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