Good news: USB4 mandates a direct host-to-host connectivity! Something it brought in from Thunderbolt. Hypothetically that should be 40Gbit connections, readily available.
I do hope that CXL 3.1 with its host to host capability makes gluess scale out easier. It's hyped as being for accelerators and attached memory, but having a much lower overhead RDMA capable fabric in every PCIe+CXL port is very very alluring. Can't come soon enough! Servers at first and maybe I'm hopelessly naive here but I do sort of expect it to show up on consumer too.
There's some folks who use this for clustering. Here's a reddit around Mac systems. The top link is to a really not great hub-spoke model usage (not everyone has BGP skills alas). I've linked to that, 19m35s in. https://www.reddit.com/r/MacStudio/comments/1mc1z0s/anyone_c... https://youtu.be/Ju0ndy2kwlw?t=19m35s
I do hope that CXL 3.1 with its host to host capability makes gluess scale out easier. It's hyped as being for accelerators and attached memory, but having a much lower overhead RDMA capable fabric in every PCIe+CXL port is very very alluring. Can't come soon enough! Servers at first and maybe I'm hopelessly naive here but I do sort of expect it to show up on consumer too.