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bobzhuyb / ns3-rdma

NS3 simulator for RDMA over Converged Ethernet v2 (RoCEv2), including the implementation of DCQCN, TIMELY, PFC, ECN and shared buffer switch
GNU General Public License v2.0
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some questions about how to realize rdma on server #6

Open hdtjiang opened 7 years ago

hdtjiang commented 7 years ago

Is the DCQCN based on RoCEv2 the only one to realize RDMA? I compare the code with the basic ns3 about udp. But I cannot find the code about kernel bypass.Have you realizede it ? Thanks for your reply.

bobzhuyb commented 7 years ago

This is a SIMULATOR for the network protocol. It is not intended for evaluating the OS stack implementation.

If you want to try the actual implementation, DCQCN has been shipped with Mellanox CX3-PRO and CX4 NICs. Yes, it's implemented in NIC, totally bypassing the kernel and CPU.

RoCEv2 is not the only way to realize RDMA. InfiniBand, for example, has been a popular RDMA solution. RoCEv2 is relatively younger, and only requires common Ethernet switches instead of InfiniBand switches.

RoCEv2 can run without DCQCN. DCQCN improves the performance of RoCEv2 in multi-hop networks.