Messages in this thread | | | Date | Wed, 10 Sep 2008 14:07:21 -0600 | From | Matthew Wilcox <> | Subject | Re: [PATCH 2/4 v2] PCI: support ARI capability |
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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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