Cache-aware data structures for packet forwarding tables on general purpose CPUs

04/24/2018

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by   Maksim Yegorov, et al.

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Longest prefix matching has long been the bottleneck of the Bloom filter-based solutions for packet forwarding implemented in software. We propose a search algorithm to match a destination IP address against a compact representation of the FIB table in CPU cache on general purpose hardware with an average performance target of O(log n) for an n-bit address.