Messages in this thread | | | Date | Mon, 18 Nov 2013 17:32:19 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 0/3] Early use of boot service memory |
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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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