Offloading I/O to Dedicated Cores: An Asymmetric io_uring Backend for Seastar and ScyllaDB

This post details the design decisions behind Seastar's new `asymmetric_io_uring` backend, explaining how it shifts I/O work from application cores to a dedicated subset of cores. It contrasts this with the existing symmetric `io_uring` and `linux-aio` backends, highlighting the benefits of reduced context switching, cache pollution, and latency variance for compute-heavy workloads.