Your Load Balancer Is Throwing Away the KV Cache
Article summary
Quick briefing — cleaned from the original RSS feed
Round-robin is prefix-blind. KV-cache-aware routing sends requests to the replica that already prefilled their prefix — cutting time-to-first-token without hotspotting. TL;DR: Before an LLM emits a token it must prefill the whole prompt into a KV cache — the expensive part. In 2026, requests share massive prefixes (system prompts, retrieved documents, the conversation so far). A round-robin load balancer is prefix-blind : it scatters those requests so every replica recomputes the same prefix.…
1Key Takeaways
- KV-cache-aware routing sends requests to the replica that already prefilled their prefix — cutting time-to-first-token without hotspotting.
- TL;DR: Before an LLM emits a token it must prefill the whole prompt into a KV cache — the expensive part.
- In 2026, requests share massive prefixes (system prompts, retrieved documents, the conversation so far).
- A round-robin load balancer is prefix-blind : it scatters those requests so every replica recomputes the same prefix.….
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — ML reports that kV-cache-aware routing sends requests to the replica that already prefilled their prefix — cutting time-to-first-token without hotspotting.
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