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SubjectRe: [PATCH v7 24/27] x86: Add swiotlb force off support
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> writes:

> On Mon, Dec 17, 2012 at 11:15:56PM -0800, Yinghai Lu wrote:
>> So use could disable swiotlb from command line, even swiotlb support
>> is compiled in. Just like we have intel_iommu=on and intel_iommu=off.
>
> You really need to spell out why this is useful.

YH why can't we safely autodetect that the swiotlb is unusable when
there is no memory below 4G free?

Eric


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