Hello everyone, I have encountered a problem regarding the migration process using RDMA, which seems to have a longer total time compared to TCP. Here are the relevant details: - Network configuration: Mellanox ConnectX-3 Pro EN 40G NIC - Software versions: QEMU 4.2.0, kernel 4.4.0 Steps taken: 1) Installed MLNX_OFED from NVIDIA as instructed. 2) Compiled QEMU with the "--enabled-rdma" flag to ensure the presence of librdmacs and libibverbs interfaces. 3) Verified bandwidth using iperf for both RDMA and TCP. RDMA achieved 26 Gbits/sec, while TCP reached 20 Gbits/sec, demonstrating the expected superiority of RDMA. 4) During the migration of a 30GB VM at the maximum migration speed of 40G, I observed the following migration times: - RDMA: 13531ms - TCP: 13483ms I'm uncertain about what might be causing this discrepancy. Any insights or suggestions would be greatly appreciated. Thank you. -- Thanks, Roja
