Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is notenough ram for it

From: Yinghai Lu
Date: Fri Jan 04 2013 - 17:10:14 EST

On Fri, Jan 4, 2013 at 1:02 PM, Shuah Khan <shuahkhan@xxxxxxxxx> wrote:
> Pani'cing the system doesn't sound like a good option to me in this
> case. This change to disable swiotlb is made for kdump. However, with
> this change several system fail to boot, unless crashkernel_low=72M is
> specified.

this patchset is new feature to put second kdump kernel above 4G.

> I would the say the right approach to solve this would be to not
> change the current pci_swiotlb_detect_override() behavior and treat
> swiotlb =1 upon entry equivalent to swiotlb_force set.

that will make intel system have to take crashkernel_low=72M too.
otherwise intel system will get panic during swiotlb allocation.


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