I have no experience about what you are trying to achieve, but rdma and related technologies (infiniband, qlogic, sr-iov, ROCE) is not it. These are network technologies that permit high bandwidth/low latency data transfer between hosts. Most of these bypass the IP stack entirely.
Infiniband is a network stack that enable RDMA, it’s only vendor is now NVIDIA which acquired mellanox. Qlogic was another vendor, but it got acquired by Intel that tried to market it as Omnipath, but it was spinned off to Cornelis network.
Sr-iov is a way to share an infiniband card to a virtual machine on the same host.
ROCE is an implementation of the rdma software stack over ethernet instead of infiniband.
I’m fairly sure there’s a way to provide compatible PCIe devices over IP on a network, or “some network” (if you’re bypassing the IP stack, perhaps). I just don’t know what it’s called, and I’m getting more confused by whether RDMA support can do this or not. Essentially, I want to leverage what SR-IOV allows me to do (create virtual functions of eligible PCIe devices) and pass them over IP or some other network tech to VMs/CTs on a different physical host.
RoCE/iWARP is the technology with which one would be able to route DMA over the network. The bandwidth of the network is the bottleneck but we’ll ignore that for now.
SR-IOV is a way to share virtual functions of PCIe devices on the same host.
Regardless of whether one uses IB or iWARP, they can also route data to and from a PCIe device attached to a host to another host over the network. I still have to research the specifics but I’m now positive that it can be done.
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I have no experience about what you are trying to achieve, but rdma and related technologies (infiniband, qlogic, sr-iov, ROCE) is not it. These are network technologies that permit high bandwidth/low latency data transfer between hosts. Most of these bypass the IP stack entirely.
Infiniband is a network stack that enable RDMA, it’s only vendor is now NVIDIA which acquired mellanox. Qlogic was another vendor, but it got acquired by Intel that tried to market it as Omnipath, but it was spinned off to Cornelis network.
Sr-iov is a way to share an infiniband card to a virtual machine on the same host.
ROCE is an implementation of the rdma software stack over ethernet instead of infiniband.
I’m fairly sure there’s a way to provide compatible PCIe devices over IP on a network, or “some network” (if you’re bypassing the IP stack, perhaps). I just don’t know what it’s called, and I’m getting more confused by whether RDMA support can do this or not. Essentially, I want to leverage what SR-IOV allows me to do (create virtual functions of eligible PCIe devices) and pass them over IP or some other network tech to VMs/CTs on a different physical host.
Do you mean stuff like PCIeoF (PCIe over Fiber)?
Is there a PCIEoE?
I don’t think so, at least I haven’t heard of it. I guess Ethernet would have too much overhead
I suppose RoCE/iWARP were what I was asking for
I read a bit more and I’d like to add:
RoCE/iWARP is the technology with which one would be able to route DMA over the network. The bandwidth of the network is the bottleneck but we’ll ignore that for now.
SR-IOV is a way to share virtual functions of PCIe devices on the same host.
Regardless of whether one uses IB or iWARP, they can also route data to and from a PCIe device attached to a host to another host over the network. I still have to research the specifics but I’m now positive that it can be done.
Thanks