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Utilization-Based Policy (Uoff). When the active cache footprint is small and a sliceis underutilized, disabling the slice can save leakage power while incurring only negligibleperformance degradation. Motivated by this, the Uoff policy selects the power-offvictims from the slices with the utilization (calculated by Equation (1)) less than athreshold, Uth. Among the low-utilization power-off victims, the slices with lower utilizationare chosen to be turned off. At most Noff slices are powered off at an epoch toavoid burst of writebacks. Note that a higher Uth and a higher Noff would aggressivelyprovide higher power savings, but the performance degradation would also increase.We analyze the impact of different Uth and Noff settings and find that 30% and 4 aregood values for Uth and Noff, respectively.
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