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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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