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Datasheet, Volume 1 51
Power Management
Entry and exit of the C-States at the thread and core level are shown in Figure 4-3.
While individual threads can request low power C-states, power saving actions only
take place once the core C-state is resolved. Core C-states are automatically resolved
by the processor. For thread and core C-states, a transition to and from C0 is required
before entering any other C-state.
Note: If enabled, the core C-state will be C1E if all enabled cores have also resolved a core C1 state or higher.
Figure 4-2. Idle Power Management Breakdown of the Processor Cores
Processor Package State
Core 1 State
Thread 1Thread 0
Core 0 State
Thread 1Thread 0
Figure 4-3. Thread and Core C-State Entry and Exit
C1 C1E C6C3
C0
MWAIT(C1), HLT
C0
MWAIT(C6),
P_LVL3 I/O Read
MWAIT(C3),
P_LV2 I/O Read
MWAIT(C1), HLT
(C1E Enabled)
Table 4-8. Coordination of Thread Power States at the Core Level
Processor Core
C-State
Thread 1
C0 C1 C3 C6
Thread 0
C0 C0 C0 C0 C0
C1 C0 C1
1
C1
1
C1
1
C3 C0 C1
1
C3 C3
C6 C0 C1
1
C3 C6