Re: [PATCH 3/3] x86/iommu: use __GFP_ZERO instead of memset forGART

[FUJITA Tomonori]

On Sat, 27 Sep 2008 20:18:55 +0200
Ingo Molnar <mingo@xxxxxxx> wrote:

> another thing:
> 
> How hard would it be to add an CONFIG_IOMMU_DEBUG option that forces as 
> many DMA requests to go via the IOMMU as possible?
> 
> This slows things down of course so it's only for debugging - but it 
> also makes sure that we utilize the IOMMU code to the maximum - which is 
> not normally the case.

If you use iommu=force boot option, GART always tries to use the
IOMMU.
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