Messages in this thread | | | Date | Thu, 7 Jun 2007 16:58:39 -0700 | From | Andrew Morton <> | Subject | Re: [Intel-IOMMU 07/10] Intel iommu cmdline option - forcedac |
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On Wed, 06 Jun 2007 11:57:05 -0700 anil.s.keshavamurthy@intel.com wrote:
> --- linux-2.6.22-rc3.orig/Documentation/kernel-parameters.txt 2007-06-04 12:40:29.000000000 -0700 > +++ linux-2.6.22-rc3/Documentation/kernel-parameters.txt 2007-06-04 12:40:41.000000000 -0700 > @@ -785,6 +785,13 @@ > bypassed by not enabling DMAR with this option. In > this case, gfx device will use physical address for > DMA. > + forcedac
You want forcedac [X86-64]
> + With this option iommu will not optimize to look > + for io virtual address below 32 bit forcing dual > + address cycle on pci bus for cards supporting greater > + than 32 bit addressing. The default is to look > + for translation below 32 bit and if not available > + then look in the higher range.
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