What is the primary performance benefit of RDMA when used with SMB Direct?

What is the primary performance benefit of RDMA when used with SMB Direct?

• A. Lower CPU usage due to offloading memory operations
• B. Increased CPU usage
• C. Faster DNS resolution
• D. Improved antivirus scanning

Answer: (A)

RDMA with SMB Direct moves data directly between the memory of two machines through the network interface, bypassing the CPU-heavy path that normally handles data copies and protocol processing. Because the NIC handles the actual memory transfer, the CPU isn’t bogged down by copying data, organizing buffers, or handling interrupts for those transfers. This offloads memory operations from the CPU, lowering CPU usage and freeing cycles for other tasks, which translates into higher throughput and lower latency for file-sharing workloads. The other options don’t relate to how SMB Direct moves data: DNS resolution is a network lookup, antivirus scanning is an application-layer activity, and increasing CPU usage would negate the benefit.

RDMA with SMB Direct moves data directly between the memory of two machines through the network interface, bypassing the CPU-heavy path that normally handles data copies and protocol processing. Because the NIC handles the actual memory transfer, the CPU isn’t bogged down by copying data, organizing buffers, or handling interrupts for those transfers. This offloads memory operations from the CPU, lowering CPU usage and freeing cycles for other tasks, which translates into higher throughput and lower latency for file-sharing workloads. The other options don’t relate to how SMB Direct moves data: DNS resolution is a network lookup, antivirus scanning is an application-layer activity, and increasing CPU usage would negate the benefit.