[ale] IOMMU

[Vernard Martin]

Jeff Layton wrote:
> Good afternnon!
> 
>   I was wondering if someone could explain what an IOMMU is?
> We've got some IBM e325 Opteron boxes with RHEL and we're
> being told to reboot with 'iommu=off' and I'm curious if this will
> hurt performance.

The only guess I can come up with is:

I/O Memory Management Unit

now why they would have an MMU just for I/O is beyond me.

Vernard