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Subjectpci-dma disables iommu on nforce4 motherboards?
I have an asus A8N-E motherboard and recieve the following message on 
boot.

PCI-DMA: Disabling IOMMU.

I have no issues with anything not functioning. I guess i'm just
curious as to why this is done and if i'm missing out on any sort of
performance gain by not using the iommu. I have less than 4GB of ram,
would that be why it's disabled (which is why i think it is)?
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