E. Hardware-Software co-optimizati
One of the big challenge of scaling dow
is that benchmark execution is often
scaling part of voltage/frequency cur
in-efficient as it reduces the power sub
address this inefficiency, a new mech
Broadwell called Dynamic Duty Cycli
power control unit (PCU) identifies th
the efficient frequency point, based on t
The graphics engine is then continuous
the effective target frequency. This ena
C6 saving extra energy. DCC silicon
performance improvements on some b
added a new handshake between the di
optimize CPU power based on display
voltage frequency scaling. The driver d
resolution change to the PCU which
required to enable the designed frequ
clocks. This resulted in optimizing
resolution and saved ~150-300mw pow
power sharing algorithm to balance po
Platform Control Hub (PCH) and CPU
further increased the energy efficienc
infrared emission image under various p