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
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Thanks for the info!
I upgraded to Windows 7 just this Monday, and I noticed a pretty good increase in general performance and gaming performance; however, I did have some rather annoying micro-stuttering. The removal of core parking has fixed that problem.
Wow you sir rock. This fixed my FPS issue in games with windows 7. Soon as I disabled core parking, my FPS is back in its full glory. This info should totally be sticky'd or contained in a tech support sticky.
I tried disabling Intel Speedstep, disabling Catalyst AI for my Radeon HD 4870s, and nothing worked until I edited these registry keys. Now I'm getting great FPS in games with no spiking. Thanks!
this trick fixed my problems with stuttering and laggy fps