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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