From: Muli Ben-Yehuda <[EMAIL PROTECTED]> Date: Tue, 12 Feb 2008 10:52:56 +0200
> The streaming DMA-API was designed to conserve IOMMU mappings for > machines where IOMMU mappings are a scarce resource, and is a poor > fit for a modern IOMMU such as VT-d with a 64-bit IO address space > (or even an IOMMU with a 32-bit address space such as Calgary) where > there are plenty of IOMMU mappings available. For the 64-bit case what you are suggesting eventually amounts to mapping all available RAM in the IOMMU. Although an extreme version of your suggestion, it would be the most efficient as it would require zero IOMMU flush operations. But we'd lose things like protection and other benefits. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
