Re: [PATCH 1/2] msi: Invert the sense of the MSI enables.

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On May 24, 2007, at 10:51 PM, Andi Kleen wrote:

Do we have a feel for how much performace we're losing on those
systems which _could_ do MSI, but which will end up defaulting
to not using it?

At least on 10GB ethernet it is a significant difference; you usually
cannot go anywhere near line speed without MSI

I suspect it is visible on high performance / multiple GB NICs too.

Why would that be? As the packet rate goes up and NAPI polling kicks in, wouldn't MSI make less and less difference?

I like the fact that MSI gives us finer control over CPU affinity than many INTx implementations, but that's a different issue.

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