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Cool, but if you really want to do this sort of stuff (and don't mind being tied to the concept of some sort of arbitrator or route server) then you should be looking at circuit switched networks like Infiniband, Myrinet, DolphinLink, NUMALink etc.

HPC has been doing this stuff for decades, it's a fairly well understood problem how to achieve "zero queuing".

It's worth mentioning that Infiniband is incredibly affordable for datacenter networking and has excellent tooling on both Linux and Windows these days.




None of the networks you mention are circuit switched. They are all packet switched.

Fibre Channel is about the last example of a circuit-switched network, and it's pretty much dying.


Technically correct, Infiniband is actually a variant of virtual cut through switching. If one want's be be even more pedantic you can also point out there are implementations of Ethernet that employ the same technology at a switching level.

What really makes the big difference though is the presence of the subnet manager. Which pre-programs the routing information into each switch at fabric bring-up time. This is what causes Infiniband to act like a circuit switched network despite ofcourse being VCT at the PHY layer.


Uh, no. You aren't using those words the way other people do.


At the scale of these networks, infiniband isn't "incredibly affordable".


It's surprisingly affordable I think you will find.

List prices alone are very attractive: 36-port QDR (40gbits) switch http://www.colfaxdirect.com/store/pc/viewPrd.asp?idproduct=1... Dual port QDR HBA http://www.colfaxdirect.com/store/pc/viewPrd.asp?idproduct=1...

The cost benefits are compounding when you go up to FDR (56Gbits) and make use of RDMA aware protocols, like iSER, SRP or SMB3.


"At the scale of these networks". These are warehouse-scale data centers.




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