The "clusters" that support this have to be co-located in the data center - I guess they have to be on the same ToR switch or something. That gives less flexibi

The "clusters" that support this have to be co-located in the data center - I guess they have to be on the same ToR switch or something. That gives less flexibility for deployment, meaning there's less chance of being able to spawn 50 new VM instances when you need to. Also I expect they cost more than VMs without RDMA support, whereas the DPDK support seems to be free. I'll hopefully get chance to do some experiments soon.