Zero-Copy Networking in Rust
•system
The Problem
Conventional packet processing involves multiple memory copies between kernel space and user space. This creates a bottleneck in high-throughput applications.
Zero-Copy via RDMA
Remote Direct Memory Access (RDMA) allows network adapters to transfer data directly to/from application memory.
Implementation Details
We use the ibverbs crate to interact with the RDMA stack. Memory must be registered with the NIC before it can be used for zero-copy transfers.
Results
Benchmark shows a 45% reduction in CPU utilization for 10Gbps streams.