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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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