dd processes                  Time/req(without patchset)            Time/req(with patchset)
in parallel

4                                0.025 ms                            0.00685 ms
8                                0.174 ms                            0.0071 ms
16                               0.9825 ms                           0.0115 ms
32                               2.4965 ms                           0.0315 ms
64                               4.8335 ms                           0.071 ms
128                              5.972 ms                            0.1812 ms