CPU Migration所需的IKS(big.LITTLE in-kernel switcher),應於去年2012上半年便已釋出,並持續維護進版中,因此S4釋出的系統程式,才會已經包括IKS程式碼在內,只是如同Linaro的Nicolas Pitre所說,那是很舊的版本。且按AndrieLux的驗證,也無法在S4上面順利工作。
----------------------------------------------------------------------- Meanwhile, the power deficit of running a task which could easily be handled by an A7 core, and having it instead run on the A15 can be massive. Such situations is why Qualcomm goes towards asynchronous clock planes for each CPU. ARM’s architecture however cannot do this by design and all cores inside a cluster must run at the same clock.
And to put a nail through such false claims which cannot subjectively hold their weight: We have Samsung’s own leaked internal presentation where they admit that cluster migration only holds a limited power advantage and use of a big.LITTLE system, it goes against ARM’s own claims, and through discussions with persons involved in development of software for the system: PR bullshit -----------------------------------------------------------------------