TLDR Tech / Practical
vLLM Enhances Agentic Workloads with Bi-Directional KV Transfer
The vLLM framework now supports bi-directional KV cache transfer, enabling prefill and decode nodes to reuse context across conversation turns in disaggregated serving. This method, which returns retained KV blocks from the decode node to the prefill node, eliminates redundant precomputation and shortens the time to the first token. Benchmarks conducted on Amazon EC2 P5en instances for multi-turn conversations showed reductions in time to first token of up to 1.6x for Qwen3-32B and 3.3x for zai-org/GLM-5-FP8.
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