4 ms·

This is slightly off-topic, but... There's plenty of references to physical Infiniband cards being allocated to a guest VM. What I haven't seen though is a hy

by rb12345 13y ago

This is slightly off-topic, but... There's plenty of references to physical Infiniband cards being allocated to a guest VM. What I haven't seen though is a hypervisor-level Infiniband vswitch. I wonder if that could help with some of the latency issues; for example, inter-VM memory access could be done via host-level shared memory. Ideally the vswitch could handle inter-host links too, saving the need for manual assignment of cards to VMs.

wmf 13y ago
Mellanox did some experiments a few years ago that showed that DMAing to the NIC and back was actually faster than going through dom0 in software. Things may have changed since then, although it's probably irrelevant since the people who want to use RDMA and the people who want to use VMs don't overlap much.