Comment by kev009

I don't think there is a ton of overlap. tokio is appropriate for general userspace apps, ranging anywhere from a CLI, GUI, API or web app. DPDK and SPDK are specialized fast paths for building network data paths and storage solutions that come with tradeoffs: DPDK uses poll mode drivers, outside of the operating system, which have various implications including busy waiting and taking over the interface. That is why DPDK is fast, no kernel/userspace context switching and copies, and the drivers are tuned for the polling model. But it's not a general purpose building block.