Order of the Butterfly
Posts: 365 from 2003/3/28
except that it's two Cortex-A7 cores, not one
It's configurable, you can have 1 - 4 A7s with 1 - 4 A15s or various combinations thereof.Quote:
Adding low-power core(s) for lower overall power consumption is by the way a popular concept in ARM land:
Using a smaller core to do a specific task is nothing new.
The most similar idea is Nvidia's but their system doesn't appear to be cache coherent so you have to flush the caches when switching between cores.
The big-little system is cache coherent so is a lot faster and doesn't require cache flushes. The switching can also be done at the hypervisor level so the OS doesn't even know it's happened.
The Nvidia also only uses a lower power A9 rather than the much lower power A7.
What's going to be interesting is how Intel are going to respond to this. Their super 22nm FinFET process was meant to get them down to ARM's power levels. That might happen compared with the A15 but the A7 is a complete different ball game, they don't have anything to compete with it.