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

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Date:	Fri, 27 Jun 2008 19:52:47 +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,
	Ben-Ami Yassour1 <BENAMI@...ibm.com>
Subject: Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry

On Fri, Jun 27, 2008 at 01:44:15PM -0400, Muli Ben-Yehuda wrote:
> On Fri, Jun 27, 2008 at 07:40:35PM +0200, Joerg Roedel wrote:
> 
> > Yes. As I said, this is for the non-isolating case. For the
> > isolation case (which is needed for protection) it is harder to
> > optimize. But there I think about some sort of lazy IOMMU TLB
> > flushing. The flushing and 'wait for the flush to finish' is the
> > most expensive part in the mapping and unmapping code path. But this
> > needs some experiments.
> 
> Agreed. The paper I just posted to the iommu mailing list has some
> ideas and experimental data.

Cool. I wasn't aware if that paper. I will read it next week. Thanks for
the pointer to it.

Joerg

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