On Wed, 2008-01-23 at 09:53 +0100, Andi Kleen wrote:
quoted text
> Ingo Molnar <mingo@elte.hu> writes:
> 
> > that would probably be the case if it's multiple sockets - but for 
> > multiple cores exactly the opposite is true: the sooner _both_ cores 
> > finish processing, the deeper power use the CPU can reach. 
> 
> That's only true on setups where the cores don't have 
> separate sleep states. But that's not generally true anymore.
> e.g. AMD Fam10h has completely separate power planes for
> the cores and I believe newer Intel CPUs can also let their 
> cores go to at least some sleep states independently (although
> the deepest sleep modi still require all cores idle) 

I think we can expect everyone to rapidly evolve towards full
independence of core power states. In fact, it wouldn't surprise me if
we eventually get to the point of shutting down individual functional
units like the FPU.

-- 
Mathematics is the supreme nostalgia of our time.

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