Re: [PATCH v3] x86, kdump: Set crashkernel_low automatically

From: H. Peter Anvin
Date: Mon Mar 18 2013 - 18:54:58 EST

On 03/18/2013 02:25 PM, Yinghai Lu wrote:
> Current code does not set low range for crashkernel if the user
> does not specify that.
> That cause regressions on system that does not support intel_iommu
> properly.
> Chao said that his system does work well on 3.8 without extra parameter.
> even iommu does not work with kdump.
> Set crashkernel_low automatically if the user does not specify that.
> For system that does support IOMMU with kdump properly, user could
> specify crashkernel_low=0 to save that 72M low ram.
> -v3: add swiotlb_size() according to Konrad.
> Reported-by: WANG Chao <chaowang@xxxxxxxxxx>
> Tested-by: WANG Chao <chaowang@xxxxxxxxxx>
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>

Can we get a bit more of an explanation instead of "and etc 8M"? At
least a hint of what kind of objects would go in there...


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