Re: [PATCH 0/3] Early use of boot service memory

[H. Peter Anvin]

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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