On Tue, 24 Jun 2014 09:35:10 -0700
Ben Greear <[email protected]> wrote:

> On 06/23/2014 09:03 PM, Brandeburg, Jesse wrote:
> > I always just check for iommu and dmar in dmesg. 
> > 
> > You should be able to boot with intel_iommu=off ?
> 
> Is there any difference (or down-side) to doing intel_iommu=off
> as opposed to just disabling VT-d in the BIOS?
> 
> Thanks,
> Ben
> 

Same effect, and you don't have to mess with BIOS.
IOMMU slows things down because driver has to do all the iommu map calls.

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