linux-kernel - Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry

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Message-ID: <20080627165430.GD10197@8bytes.org>
Date:	Fri, 27 Jun 2008 18:54:30 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Muli Ben-Yehuda <muli@...ibm.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Adrian Bunk <bunk@...nel.org>,
	Joerg Roedel <joerg.roedel@....com>, tglx@...utronix.de,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, bhavna.sarathy@....com,
	Sebastian.Biemueller@....com, robert.richter@....com
Subject: Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry

On Fri, Jun 27, 2008 at 12:39:45PM -0400, Muli Ben-Yehuda wrote:
> On Fri, Jun 27, 2008 at 04:47:29PM +0200, Andi Kleen wrote:
> 
> > Also it should ideally describe that there is a trade off between
> > reliability and performance with IOMMU enabled.
> 
> I agree that there's a performance tradeoff with current generation
> hardware and ingerfaces, but it wouldn't be fair to single out a
> single IOMMU implementation ;=)

True. At least for the case without device isolation I have some
optimizations in mind which will minimize the performance tradeoff. I
hope to have them ready for 2.6.28 :)

Joerg.

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