Who is affected
It only applies to Windows 7 X64 and X32 and only in systems using more than 2 physicial CPU's and/or more than 2 "logical" cores - ie: Core i7's.

The Problem
See here for a bit of info / explanation / more info about CPU Core Parking - http://blogs.technet.com/askperf/archiv ... scing.aspx

Core Parking is a feature of Windows 7 that is causing rare performance problems. I don't notice it on my home i7 / Win7 system but some people are getting microstutters and odd behavior in certain programs. Without the following " tweak" you may see CPU spiking in your programs and Windows Task Manager - some CPU cores will be "turned off" / "parked" depending on load and they will be dynamically turned on or off and dynamically loaded up or down as the system deems necessary - the scope for glitchs / pops / clicks / droputs etc.... in such an environment is simply enormous. To the best of my knowledge, there is no known "switch" to turn it off - no utility I am aware of to "tweak" it off.

The Fix
- Go to Regedit
- Select Edit > Find... and find this key: " 0cc5b647-c1df-4637-891a-dec35c318583 "
- Within this key, there is a value called: " ValueMax " This value represents the % number of cores the system will park
- Change the value of " ValueMax" to 0 so that, it matches " ValueMin "
- You will have to find the key a few times and repeat the process for each time it is found - the number of instances will depend on the number of power profiles in your system. To do this go back up to Edit > Find Next. (I had 3 instances of this key in my registry.)
- Do a full shutdown and power-off and cold-re-start.

The Result
Better load balancing across all you CPU cores - no spiking - in Windows 7 Task Manager



Testimonials







Taken from:
http://forum.cakewalk.com/tm.aspx?m=1861804

Wow nice article & write up. Easy to read. idk if it works because I don't have windows 7, but nonetheless nice.

I always knew windows was parking cpus. It's unbelievable why it happens sometimes. I guess it's purpose was to save power. My friend uses a server comp. (2 physical cpus with 4cores each) as his main computer. He's always amazed to open task manager when he gets the hourglass & find at least 3 cores not doing anything. Unbelievable.

How can you tell which firefox window is hogging up the cpu? Firefox browser often starts consuming 100% of the processor time slowing down the computer. Closing windows until you find the right window helps. Is there any way to tell which window it is that is using up the cpu?
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o thanks for resurrecting this.... I just did it. I was at hex 64 or # 100 as max. Weird.