Well mmap can still cause issues if you run short on RAM, and the disk access can cause latency and overall performance issues. It's better than nothing though.

Agree that k/v cache is underutilized by most folks. Ollama disables Flash Attention by default, so you need to enable it. Then the Ollama default quantization for k/v cache is fp16, you can drop to q8_0 in most cases. (https://mitjamartini.com/posts/ollama-kv-cache-quantization/) (https://smcleod.net/2024/12/bringing-k/v-context-quantisatio...)