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LCA: Server power managementLCA: Server power managementPosted Feb 1, 2011 21:22 UTC (Tue) by martinfick (subscriber, #4455)In reply to: LCA: Server power management by robert_s Parent article: LCA: Server power management
No, it usually involves OS support.
http://en.wikipedia.org/wiki/Intel_Turbo_Boost
"Turbo Boost activates when the operating system requests the highest performance state of the processor. "
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LCA: Server power management Posted Feb 1, 2011 22:41 UTC (Tue) by mjg59 (subscriber, #23239) [Link]
Right, but that just appears as another P state to the OS - it's entirely possible that the BIOS will have programmed that before the OS asserts any control over the functionality. The problem with turbo mode is that without knowing the full state of the processor (the C state of every thread, the temperature of every sensor, the current power draw of every core) and without knowing the algorithms used (which the vendors consider secret), the OS has no way of knowing whether asking for the highest performance state will give it performance identical to the next highest state, or anywhere up to 60% higher.
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