For CPU that support SMT, software can request the core to enter some thread C state. Each hardware thread can enter a different thread C state. If all thread requested thread C state, the CPU will enter into a corresponding core C state based in the shallowest thread C state requested.
If a thread C state request does not induce a core C state, the power saving is minimal.
When all cores in a package entered some deep C states, the package could entered into a package C state to further save power.
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