Increasing CDN cache hit rates Deploying Hierarchical Filtering (HiFi) Cache Logic to enhance streaming MAKING VIDEO PERSONAL White Paper2 Increasing CDN cache hit rates Increasing CDN cache hit rates Why HiFi Caching? Despite 30 years of research in caching policies, most CDN caches still employ least recently used (LRU) as the asset eviction policy. Unfortunately, LRU policy produces suboptimal cache hit-rates in a variety of circumstances related to video streaming. Some open source caches such as Apache Traffic Server or Squid offer the option to use greedy dual size frequency (GDSF) or least frequency used with dynamic aging (LFU-DA) eviction policies instead of LRU. While these policies produce somewhat better hit-rates than LRU, they do not produce optimal hit rates either

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