Van de Ven: Some basics on CPU P states on Intel processors

Here's an interesting post from Arjan van de Ven on how power management works in contemporary Intel processors. In short, it's complicated. "The key thing here is that Core A gets a very variable behavior, independent of what it asked for, due to what Core B is doing. Or in other words, the forward predictive value of a P state selection on a logical CPU is rather limited."

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