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> I'm always pleasantly surprised when I see power management correctly configured at a client precisely because it is so rarely done correctly.

Let's say I have Linux instances in the cloud. What would be the steps to take for proper power management?

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As far as I know, there are no steps you can take if you're running your instance in a virtual machine. Only the hypervisor host and/or the firmware can control the processor power and sleep states.

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