Core Parking is a new feature, that dynamically selects a set of processors that should stay idle and not run any threads based on the current power policy and their recent utilization. This decreases the energy consumption and therefore reduces the heat and power usage. In Windows normally we have to manually edit registry entries to enable or disable this feature, and it requires a reboot.
The state of individual parked cores can be observed in Resource Monitor under the CPU tab, on the right side.
If you are using some new multicore Intel CPU like i7, you will notice that some of the cores are marked as parked. This is a new feature of Windows 7 and it helps in optimizing energy consumption of your CPU.
Sometimes, by adjusting the Core parking by performance of the PC, you can even reduce micro shutters which occur when playing a game or using some resource-heavy. This new feature of Windows 7 manages Core parking well, but if you want, you can tweak it to suit your requirements. Core packing on Windows 7 is pretty good, but by tweaking in according to your needs can make it even better.
Enable or Disable Core parking in Windows 7
There are two utilities that may help you: Park Control and Manage Parked CPUs.
Using Park Control Utility we manage our Core Parking percentage instead of registry tweak or reboots. It’s a very simple tool not much explanation needed. Remember this tool works only on new generation processors like Intel’s I series or AMD Bulldozer platform. When you first open it you’ll get a warning about the application.
Make sure you create a backup of your Power Configuration.
To do so open up command prompt and type in powercfg.exe -qh > mybackup.txt.
Once you click “Yes” it will take you to the application.
Here you can choose the power plan. Next under “CPU Parking” for “On AC” or “On Battery” you can click on “Enable” to enabled it and enter the % of core you want to enable. Once your done click on “Apply” and click “OK” now you can go to Resource Monitor and click the CPU tab to verify if Core Parking has been enabled. You can download the application from here.
Manage Parked CPUs
This utility will allow you to easily enable or disable core parking for your CPU. Run the tool and click on Check Status. Core parking may not be enabled for all the CPU’s, even though the registry value may indicate that the cores are parked. You From now you can press “Park All” or “Unpark All” buttons to enable or disable parking. You can get it here.
If you are looking for a hotfix that will selectively disable the Core Parking feature in Windows 7 or in Windows Server 2008 R2, visit KB2646060.
I can’t stress enough - do it on your own risk – and that too if you know what you are doing. And please create a System Restore point before you make any changes so you can revert back if need be.