On 11/15/2013 10:30 AM, Vivek Goyal wrote:
>
> And IOMMU support is very flaky with kdump. And IOMMU's can be turned
> off at command line. And that would force one to remove crahkernel_low=0.
> So change of one command line option forces change of another. It is
> complicated.
>
> Also there are very few systems which work with IOMMU on. A lot more
> which work without IOMMU. We have all these DMAR issues and still nobody
> has been able to address IOMMU issues properly.
>
Why do we need such a big bounce buffer for kdump swiotlb anyway?
Surely the vast majority of all dump devices don't need it, so it is
there for completeness, no?
-hpa
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