Dynamo shows why prompt memory alone can overload one GPU
Abhishekcur · x · 2026-07-27
Why cache-aware routing can overload the best GPU
The thread starts with a failure mode in KV routing for LLM serving:
- If every request starts with the same long system prompt, the first GPU to answer will also be the one that remembers that prompt.
- Naively routing future requests to that GPU causes a positive feedback loop.
- The better it caches, the more traffic it attracts.
- Soon one GPU is drowning while others sit idle with the same prompt cached.
The conclusion is that prompt memory is not enough. The real problem is how to weigh memory against queueing and capacity at the same time.
Related event: How NVIDIA Dynamo Prices LLM GPU Routing Instead of Hard KV Rules(14 posts)→
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