Re: pci-dma disables iommu on nforce4 motherboards?

[Jeff Garzik]

Ed Sweetman wrote:
> 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)?  -

What happens if you boot with iommu=force ?

	Jeff



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