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Abstract
This paper investigates the dual-mode power-saving strategy designed for the 100G Energy Efficient Ethernet. The process of this strategy is a sequence of cycles, where each cycle is an interval elapsed between two consecutive instants when the buffer of the Ethernet interface becomes empty. In each cycle, the interface first enters the fast-wake mode to perform the conditional sleep-mode selection of the strategy. If the number of arrivals during the fast-wake mode reaches a threshold, the interface directly wakes up; otherwise, it proceeds to the deep-sleep mode. The sequence of cycles switches between two types: deep-sleep cycles with deep-sleep mode and light-sleep cycles without deep-sleep mode. We analyze the dual-mode strategy based on the condition of the number of arrivals during the fast-wake mode. We first derive the weights of conditions according to the feature of the conditional sleep-mode operation, and then calculate the unconditioned performance measure of the dual-mode strategy based on the weighted average of that of these two kinds of cycles. Finally, we obtain the close-form expressions of the power efficiency and the mean delay, based on which we provide a set of parameter selection rules. We show that the dual-mode strategy with these rules can select suitable sleep modes according to the instantaneous traffic rate, and thus perform well under bursty input traffic.
Highlights
In recent years, the demands for high-speed Ethernet have been driven by ever-increasing Internet use and emerging bandwidth-hungry applications, such as 4K/8K video [1] and high-performance computing [2]. 100G Ethernet is gradually displacing the 10G Ethernet and will become mainstream very soon [3]
We propose an analytical model based on the concept of conditional sleep-mode, which treats the performance of the dual-mode strategy as the weighted average of that of the DS cycle and the LS cycle
In this paper, we propose an analytical model based on the concept of conditional sleep-mode to analyze the dual-mode strategy designed for the 100G EEE protocol
Summary
The demands for high-speed Ethernet have been driven by ever-increasing Internet use and emerging bandwidth-hungry applications, such as 4K/8K video [1] and high-performance computing [2]. 100G Ethernet is gradually displacing the 10G Ethernet and will become mainstream very soon [3]. In this case, the power efficiency is poor when the traffic rate is low. Assumption A4 is justified since it ensures a relatively long duration of the DS mode such that the interface can obtain a high power efficiency when the input traffic rate is low Under these assumptions, the dual-mode strategy can be modeled as an M/G/1 queue with vacations governed by two sets of thresholds and the frame arrival process, which is like the 10G EEE studied in [16].
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