When Fancy Eviction Fails: Rethinking Cache Replacement For LLM Prefix Reuse
Factual evidence
What the source reports
An empirical study on LLM prefix caching reveals that complex cache eviction policies offer minimal benefit over basic heuristics.
Inspect the evidence
- Inclusion basis
- Enterprise AI
- Publisher and source type
- arXiv cs.LG — Machine Learning · RESEARCH
- Published by source
- 25 September 2026
- Collected by OneBench
- 26 Sept 2026, 03:02 UK
Stored source excerpt
arXiv:2609.28870v1 Announce Type: cross Abstract: Long-running LLM applications repeatedly send growing context, making prefix caching critical for reducing prefill cost. Yet prefix-cache behavior under agentic…
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OneBench interpretation
Institutional assessment
So what
Complex prefix-cache eviction algorithms yield marginal cost savings over simpler baselines in long-running agentic deployments.
Do what
Review LLM cache eviction strategies with the team responsible for infrastructure optimization to avoid over-engineering serving pipelines.