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KV Cache Offloading to NVMe: The Break-Even Bandwidth Math and Where It Does Not Pay Off

This story is from 2026-10-21. It is preserved in the archive; the latest stories are on the live feed.

TL;DR Loading a cached KV prefix from NVMe only beats recomputing it when the drive can deliver more bytes per second than the break-even bandwidth for that prompt length, model, and GPU. In a recent measurement study (arXiv 2609.11744, Llama 3.2 3B on an H100 node), the break-even bandwidth fell f…

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  1. 2026-10-21 16:04 · DEV Community — Machine Learning
    KV Cache Offloading to NVMe: The Break-Even Bandwidth Math and Where It Does Not Pay Off

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