Method, system, and apparatus to decrease CPU temperature through I/O bus throttling
View Patent ↗A method, apparatus, and system are disclosed. In one embodiment the method detects a temperature event in a processor and then modifies the bus frequency of an I/O bus coupled to an I/O controller hub in response to the temperature event. In another embodiment, the apparatus includes a temperature detection unit that detects a temperature event in a processor and, additionally, a bus frequency modification unit that will modify the bus frequency of an I/O bus in response to the temperature event.
1. A method, comprising:
detecting a temperature event in a processor; and
modifying a bus frequency of only a first input/output (I/O) bus in response to the temperature event, wherein the I/O bus couples an I/O controller hub to at least one I/O device and the I/O controller hub is coupled to the processor.
2. The method of claim 1 , wherein detecting a temperature event in a processor further comprises:
monitoring a signal from a thermal event pin associated with the processor; and
acknowledging a temperature event within the processor when the monitored signal changes.
3. The method of claim 2 , wherein monitoring the signal further comprises monitoring the signal with a device separate from the processor.
4. The method of claim 3 , wherein modifying a bus frequency further comprises:
performing an I/O bus reset for the first I/O bus; and
altering the I/O bus frequency of the first I/O bus after the I/O bus reset.
5. The method of claim 4 , wherein the device is connected to an interface for interfacing with a bridge controller controlling the first I/O bus.
6. The method of claim 5 , wherein performing the first I/O bus reset comprises sending an I/O bus reset command for the first I/O bus to the bus bridge controller from the device through the interface.
7. The method of claim 4 , wherein altering the first I/O bus frequency further comprises reducing the first I/O bus frequency.
8. The method of claim 5 , wherein the interface further comprises a System Management Bus.
9. The method of claim 1 , wherein detecting a temperature event in a processor comprises:
externally monitoring the temperature of the processor die; and
acknowledging a temperature event within the processor when the monitored temperature reaches a predetermined level.
10. The method of claim 1 , wherein the first I/O bus further comprises a peripheral data bus.
11. The method of claim 1 , wherein the first I/O bus further comprises a PCI-X bus.
12. A system, comprising:
a host bus;
a processor coupled to the host bus;
a bridge controller coupled to the host bus for receiving signals from the processor;
a bus system that is connectable to the bridge controller, the bus system comprising:
one or more I/O busses coupled to the bridge controller, each I/O bus of the one or more I/O busses including one or more expansion slots for receiving an I/O peripheral device;
an interface connected to the bridge controller; and
a device connected to the interface, wherein the device detects a temperature event in the processor and modifies the frequency of one or more of the I/O busses only in response to the temperature event.
13. The system of claim 12 , wherein the system:
monitors a signal from a thermal event pin associated with the processor; and
acknowledges a temperature event within the processor when the monitored signal changes.
14. The system of claim 12 , wherein the system modifies the bus frequency of the one or more of the I/O busses by:
performing an I/O bus reset for each of the one or more I/O busses; and
altering the I/O bus frequency of each of the one or more I/O busses after the I/O bus reset.
15. The system of claim 14 , wherein the system reduces the I/O bus frequency each of the one or more I/O busses.
16. The system of claim 12 , wherein the interface further comprises a System Management Bus.
17. The system of claim 12 , wherein the system detects a temperature event by:
externally monitoring the temperature of the processor die; and
acknowledging a temperature event within the processor when the monitored temperature reaches a predetermined level.
18. The system of claim 12 , wherein at least one of the one or more I/O busses further comprises a peripheral data bus.
19. The system of claim 12 , wherein at least one of the one or more I/O busses further comprises a PCI-X bus.
20. An apparatus, comprising:
a temperature detection unit to detect a temperature event in a processor; and
a bus frequency modification unit to modify a bus frequency of only a first input/output (I/O) bus in response to the temperature event, wherein the I/O bus couples an I/O controller hub to at least one I/O device and the I/O controller hub is coupled to the processor.
21. The apparatus of claim 19 , wherein the temperature detection unit is further adapted to:
monitor a signal from a thermal event pin associated with the processor; and
acknowledge a temperature event within the processor when the monitored signal changes.
22. The apparatus of claim 19 , wherein the I/O bus frequency modification unit is further adapted to:
perform an I/O bus reset for the first I/O bus; and
alter the I/O bus frequency of the first I/O bus after the I/O bus is reset.
23. The apparatus of claim 19 , wherein the temperature detection unit is further adapted to:
externally monitor the temperature of the processor die; and
acknowledge a temperature event within the processor when the monitored temperature reaches a predetermined level.
24. The apparatus of claim 19 , wherein the temperature detection unit is further adapted to:
monitor the ambient temperature of the air in a computer system case the processor is enclosed within; and
acknowledge a temperature event within the processor when the monitored ambient temperature reaches a predetermined level.