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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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