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    SubjectRe: [PATCH 2/4 v2] PCI: support ARI capability
    On Wed, Sep 10, 2008 at 03:48:04PM +0800, Zhao, Yu wrote:
    > >I agree with this improvement to the help text. But a further question
    > >is whether ARI even merits its own user-visible config option. Is it
    > >worth having yet another choice for users? When would someone want ARI
    > >but not SR-IOV?
    >
    > ARI is an independent PCI Express extended capability. Multi-function devices supporting this capability may use it to track dependency between different functions and assign function group numbers to these functions.
    >
    > Another reason to keep this separated with SR-IOV is that after ARI is enabled, PCI Express Endpoint may have non-zero slot number (device number), which is different from traditional PCI Express Endpoint.

    Let me ask the question slightly differently: Why would someone want to
    turn the capability off? Is it just to save a few hundred bytes in the
    kernel image, or is there some hardware that won't work? Or some other
    reason I haven't thought of?

    --
    Matthew Wilcox Intel Open Source Technology Centre
    "Bill, look, we understand that you're interested in selling us this
    operating system, but compare it to ours. We can't possibly take such
    a retrograde step."


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