Microsoft recently released the report entitled “win7 Power Management” 14-page white paper describes Windows 7 Power Management technology is how to reduce energy consumption. if you want to know exactly how energy efficient, the white paper will give you the answer. if you just want quick and easy to understand, the following will tell you that Windows 7 primary means of energy conservation.
1,idle resources power consumption
When a computer starts, not always running at full capacity, so there will be a lot of free time, so the idle time power consumption becomes an important power management technology. in win7, the idle power consumption has been effectively improved, when a hardware is not working after a certain period of time will enter a low power state has to save battery power. Including CPU, hard disk, memory and network elements have adopted this technology. For example, a full-power operation of the CPU power consumption 35w power consumption at idle is almost 0, only this one will be able to save a lot of power.
2,by the trigger to start the service
Usually the system will be in service when the system starts with the start, and then resides in the background waiting for calls. in Windows 7, the service is only part of the system is triggered by some event until after the start, such as the insertion of a device or change the IP. This reduces the long-running background process in the number of services.
3,increased processor power management
win7 integrates the latest in power management technology, which allows Windows 7 based on the current load and performance requirements to dynamically adjust the CPU performance.
4,Adaptive display brightness adjustment
Microsoft said, usually 10-15 minutes in non-operation, the monitor will automatically shut down. however, in actual use will be more short-term non-operating conditions, in order to better energy efficiency, the technology will reduce the display brightness. in addition, it can take advantage of some of the sensing device, according to the ambient light to adjust the display brightness.
win7 will support Intel’s low-power HD audio specification, it allows the codec to enter the low power battery state. win7 also supports selective suspend technology to shut down idle equipment, such as microphones and cameras such USB devices.
The current processor instruction space through the use of spare processing time to save batttery energy, but most of the energy-saving technologies need a certain length of idle time to get energy-saving effect. And this technology by making the Windows kernel to terminate at the same time and focus more dispersed than the original timer, disposed of in a short time, thus increasing the processor’s idle time.
In addition, when using the battery in the laptop case, win7 will reduce non-critical activities daemon frequency.
7,Bluetooth devices to improve power
When win7 detected Bluetooth devices in a low-power state, they will be temporarily closed, the “selective suspend.”
8,network equipment to improve power
win7 in the radio network controller for low-power mode compatibility has been enhanced, and only in the wireless AP devices support low-power mode in the case will be enabled. Vista because it can not detect in advance whether to support low-power mode, the wireless network connection will lead to a sudden interruption. win7 will prevent this from happening, before entering the low power mode will detect the first wireless AP support this mode.
9,Typical application optimization
In addition to the above listed improvements, Microsoft also turned to some specific applications, including search, browsing and small game without networking. Here is the DVD player where the optimization part:
Without affecting the playback performance under the premise of the CPU to maintain low-power mode
Intelligent data caching can reduce the drive speed
The above is in power management win7 nine important improvements compared to the previous system can save more energy. in addition to these improvements, IT professionals can use to find the power management may affect the diagnostic efficiency of the power supply problem.