Owing to the explosive increase in Internet traffic, increasing the throughput and energy efficiency of core routers is an important issue for future internet. Accessing the ternary content addressable memory (TCAM) in a core router can significantly degrade its throughput and energy efficiency owing to its low operating frequency and power consuming operations. To improve the throughput and energy‐efficiency of core routers, packet processing caches (PPCs) can be potentially used. PPCs can reduce the number of TCAM accesses by storing the TCAM lookup results in a fast and low‐energy cache memory and reusing them to process subsequent packets. To enhance the PPC performance, it is important to reduce the number of PPC misses. However, the PPC miss rate of the state‐of‐the‐art PPC is still high owing to its small capacity. In this study, we propose an effective cache replacement policy, called elevator cache (ELC) to improve the PPC miss rate. Our simulation results showed that the 8‐way ELC, which can be implementable at low hardware cost, reduced the number of PPC misses by 17.1% and 5.67% in comparison to the 4‐way least recently used (LRU) and the 4‐way ELC, respectively. Consequently, it was found that the 8‐way ELC can achieve a 1.21 times higher throughput (560 Gbps) while consuming 83% energy in comparison to conventional PPCs.

中文翻译：

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用于数据包处理缓存的有效缓存替换策略

由于Internet流量的爆炸性增长，提高核心路由器的吞吐量和能效是未来Internet的重要问题。由于其低工作频率和功耗操作，访问核心路由器中的三态内容可寻址存储器（TCAM）可能会大大降低其吞吐量和能效。为了提高核心路由器的吞吐量和能效，可以潜在地使用数据包处理缓存（PPC）。PPC可以通过将TCAM查找结果存储在快速且低能耗的高速缓存中并重新使用它们来处理后续数据包来减少TCAM访问次数。为了提高PPC性能，重要的是减少PPC丢失的次数。但是，由于PPC的容量小，其PPC丢失率仍然很高。在这个研究中，我们提出了一种有效的缓存替换策略，称为提升缓存（ELC），以提高PPC丢失率。我们的模拟结果表明，与最近最少使用的4种方式（LRU）和4种方式相比，可以以较低的硬件成本实现的8种方式的ELC减少了17.1％和5.67％的PPC丢失次数。 ELC，分别。因此，发现与传统PPC相比，8路ELC可以达到1.21倍的吞吐量（560 Gbps），同时消耗83％的能量。