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SubjectRe: [PATCH ACS v3 1/1]
On Wed, 30 Sep 2009 18:17:21 -0700
Chris Wright <> wrote:

> * Kay, Allen M ( wrote:
> > On the other hand, can we say VT-d PT mode is mainly for KVM
> > virtualization use case? If so, is it reasonable to say
> > performance of host P2P in this mode is not of highest priority?
> Guess it depends on the workload. Would be helpful to identify a use
> case that is p2p heavy (and then the impact of enabling ACS).
> > If not, another option is to have a kernel boot parameter to
> > configure an kernel boot instance to be either host kernel
> > optimized or virtualization optimized. I don't know whether this
> > is a reasonable or not ...
> I was thinking that ACS could be enabled if an IOMMU is enabled. Not
> a perfect fit, but seems reasonably close.

Allen, did you want to do these changes as an incremental patch on your
last one or just send me a replacement? Either way is fine with me.

Jesse Barnes, Intel Open Source Technology Center

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