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Improve TTFT for multi-turn agentic workloads with bi-directional KV transfer in vLLM

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Multi-turn agentic workloads reprocess growing conversation context each turn, driving up latency. See how bi-directional KV cache transfer lets prefill and decode nodes reuse previously computed context across turns, cutting time to first token by up to 1.6x for Qwen3-32B and 3.3x for GLM-5-FP8 on Amazon EC2 P5en instances with EFA.

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Multi-turn agentic workloads build on accumulated context as an agent reasons, invokes tools, and incorporates earlier results. With each new turn, the client resends the conversation history, including system instructions, prior prompts, tool results, and model responses, causing the growing context to be processed repeatedly. In Prefill-decode (P-D) disaggregation , each request is split across specialized nodes: the prefill node processes the prompt and builds its key-value (KV) cache, then…

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