...
Averaged over 100 samples for each experiment. (Using IBV_SEND_INLINE in all four experiments).
| Using RDMA | Using Send | |
|---|---|---|
One way ( |
...
incl. completion on sender) |
Using IB send: 2.753 us
...
| 1.757 us | 1.801 us |
Round trip (RPC |
...
style) |
Using IB send: 4.969 us (explains write RPC latency seen in RAMCloud: 5 + 1 = 6 us)
...
| 3.136 us | 3.219 us |
We see that a one-way RDMA easily beats the round-trip IB sendSend's currently used RAMCloud RPC.