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In this paper, we design, implement, and evaluate a traffic-aware and power-efficient multicore server system by translating incoming traffic rate to appropriate system operating level, which is then translated to optimal per-core frequency configuration. According to the varying traffic rate, the system can adjust the number of active cores and per-core frequency "on-the-fly" via the use of percore DVFS, power gating, and power migration techniques based on our new power model which considers both dynamic and static power consumption of all cores. Results on an AMD machine with two Quad-Core Opteron 2350 processors for six real network applications chosen from NetBench [19] show that our scheme reduces power consumption by an average of 41.0% compared to running with full capacity without any reduction in throughput. It also consumes less power than three other approaches, chipwide DVFS [22], power gating [17], and chip-wide DVFS + power gating [15], by 35.2%, 24.3%, and 10.5% respectively.

Latency and cost of Internet-based services are driving the proliferation of web-object caching. Memcached, the most broadly deployed web-object caching solution, is a key infrastructure component for many companies that offer services via the Web, such as Amazon, Facebook, LinkedIn, Twitter, Wikipedia, and YouTube. Its aim is to reduce service latency and improve processing capability on back-end data servers by caching immutable data closer to the client machines. Caching of key-value pairs is performed solely in memory.In this paper, we present a novel design for a highperformance web-object caching solution, KV-Cache, that is Memcache-protocol compliant. Our solution, based on TU Dresden's Fiasco.OC microkernel operating system, offers scalability and performance that significantly exceeds that of its Linux-based counterpart. KV-Cache's highly optimized architecture benefits from truly "absolute" zero copy by eliminating any software memory copying at the kernel level or in the network stack, and only performing direct memory access (DMA) for each transmit and receive path. We report experimental results for the current prototype running on an Intel E5-based 32-core server platform. Our results show that KV-Cache offers significant performance advantages over optimized Memcached on Linux for commodity x86 server hardware.2013 IEEE/ACM 6th International Conference on Utility and Cloud Computing 978-0-7695-5152-4/13 $26.00