From: "Theo de Raadt" <deraadt@openbsd.org>
Subject: Re: powersave CPU policy
To: "Lorenz (xha)" <me@xha.li>, OpenBSD tech <tech@openbsd.org>
Date: Tue, 14 May 2024 17:53:37 -0600

> This patch dynamically removes CPU cores when the system is idle to prevent
> the scheduler from using them for any task, i.e. assuming the hardware puts
> unused CPU to sleep to save some power.

I am pretty sure that assumption is incorrect.  There is some logic for
choosing Cx states for cpus, but I very much doubt that a deep-sleep mode
is chosen.