NDLI: NDN Content Store and Caching Policies: Performance Evaluation

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NDN Content Store and Caching Policies: Performance Evaluation

Content Provider	MDPI
Author	Silva, Elídio Tomás da de Macedo, Joaquim Melo Henriques Costa, António Luís Duarte
Copyright Year	2022
Abstract	Among various factors contributing to performance of named data networking (NDN), the organization of caching is a key factor and has benefited from intense studies by the networking research community. The performed studies aimed at (1) finding the best strategy to adopt for content caching; (2) specifying the best location, and number of content stores (CS) in the network; and (3) defining the best cache replacement policy. Accessing and comparing the performance of the proposed solutions is as essential as the development of the proposals themselves. The present work aims at evaluating and comparing the behavior of four caching policies (i.e., random, least recently used (LRU), least frequently used (LFU), and first in first out (FIFO)) applied to NDN. Several network scenarios are used for simulation (2 topologies, varying the percentage of nodes of the content stores (5–100), 1 and 10 producers, 32 and 41 consumers). Five metrics are considered for the performance evaluation: cache hit ratio (CHR), network traffic, retrieval delay, interest re-transmissions, and the number of upstream hops. The content request follows the Zipf–Mandelbrot distribution (with skewness factor $α = 1.1$ and $α = 0.75$ ). LFU presents better performance in all considered metrics, except on the NDN testbed, with 41 consumers, 1 producer and a content request rate of 100 packets/s. For the level of content store from 50% to 100%, LRU presents a notably higher performance. Although the network behavior is similar for both skewness factors, when $α = 0.75$ , the CHR is significantly reduced, as expected.
Starting Page	37
e-ISSN	2073431X
DOI	10.3390/computers11030037
Journal	Computers
Issue Number	3
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2022-03-04
Access Restriction	Open
Subject Keyword	Computers Telecommunications Caching Replacement Policies Named Data Networking Performance Evaluation
Content Type	Text
Resource Type	Article

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