ChipsHacker Noonabout 7 hours ago
Prefill/Decode Disaggregation Can Make Tail Latency Worse
6 min read
Prefill/decode disaggregation can worsen tail latency by distributing bottlenecks across queues and KV transfers. A July 2026 paper found prefill execution accounted for only 2-23% of P95 TTFT, with queueing and transfer dominating. Load-aware deflection and progressive transfer like Lynx offer mitigations.
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