Re: [PATCH] x86-64: disable the GART before allocate aperture

Yinghai Lu
2007-06-22T22:41:35Z

Eric W. Biederman wrote:
> The original design came from thinking about systems where using the iommu
> was mandatory. I think we almost always reserve memory below 1G for the kexec
> on panic kernel so it really shouldn't be an issue in that case. Except
> we need to pass an option to force not using the iommu. I don't think
> noiommu or swiotlb is going to make any real difference.
>
> So I'm totally in favor of turning off features if we don't need them and we
> don't take a tremendous performance hit. (People get grumpy when writing
> all of memory to disk takes completely unreasonable amounts of time).

So you prefer to
add diable_gart in shutdown or suspend func and let kexec to use swiotlb comand line?

YH