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Windows 8 pushes out the tick. See "Idle Hygiene" here:

http://blogs.msdn.com/b/b8/archive/2011/11/08/building-a-pow...

You sure about that? I read that section and it seems to be about idle duration whereas this is about turning off the timer interrupt on non-idle CPUs.

You're right, FULL_NO_HZ isn't mentioned in the blog I linked. It's more similar to CONFIG_NO_HZ.

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