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This paper presents the design of AgilePkgC (APC): a new C-state architecturethat improves the energy proportionality of servers that operate at lowutilization while running microservices of user-facing applications. APCtargets the reduction of power when all cores are idle in a shallow C-state,ready to transition back to service. In particular, APC targets the power ofthe resources shared by the cores (e.g., LLC, network-on-chip, IOs, DRAM) whichremain active while no core is active to use them. APC realizes its objectiveby using low-overhead hardware to facilitate sub-microsecond entry/exit latencyto a new package C-state and judiciously selecting intermediate power modes forthe different shared resources that offer fast transition and, yet, substantialpower savings. Our experimental evaluation supports that APC holds thepotential to reduce server power by up to 41% with a worst-case performancedegradation of less than 0.1% for several representative workloads. Our resultsclearly support the research and development and eventual adoption of new deepand fast package C-states, like APC, for future server CPUs targetingdatacenters running microservices.

AgilePkgC: An Agile System Idle State Architecture for Energy Proportional Datacenter Servers