![]() PKG C2 and C3 can not be requested explicitly by the software And the platform requests a higher power C-state, the memory access or snoop request is serviced and the package remains in the higher power C-state.But the platform did not request to keep the processor in a higher package C-state, the package returns to its previous C-state.If the break event was due to a memory access or snoop request,.If the break event is masked, the processor attempts to re-enter its previous package state.If the break event is not masked, the target processor IA core enters the processor IA core C0 state and the processor enters package C0.If a processor IA core break event is received, the target processor IA core is activated and the break event message is forwarded to the target processor IA core.Depending on the type of break event, the processor does the following: The processor exits a package C-state when a break event is detected. Entry into a package C-state may be subject to auto-demotion – that is, the processor may keep the package in a deeper package C-state then requested by the operating system if the processor determines, using heuristics, that the deeper C-state results in better power/performance.For package C-states, the processor is not required to enter C0 before entering any other C-state.The platform may allow additional power savings to be realized in the processor. ![]() ![]() Each processor IA core can be at a lower idle power state than the package if the platform does not grant the processor permission to enter a requested package C-state.A package C-state is automatically resolved by the processor depending on the processor IA core idle power states and the status of the platform components.A package C-state request is determined by the lowest numerical processor IA core C-state amongst all processor IA cores.These apply to all package C-states, unless specified otherwise: The following is a summary of the general rules for package C-state entry. The processor supports C0, C2, C3, C6, C8, and C10 package states.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |