Messages in this thread | | | Date | Fri, 27 Jun 2008 13:44:15 -0400 | From | Muli Ben-Yehuda <> | Subject | Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry |
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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.
> > I am thinking of them and I'd be surprised if you'd find any in > > such machines. Certainly I assume none of the on-board devices > > will have this ancient limitation. But hey, it could happen ;-) > > The IOMMU machine under my desk has a 32bit PCI slot with a card in > it :-)
Touche :-)
Cheers, Muli
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