Next-Gen Broadcom PCIe Switches to Support AMD Infinity Fabric XGMI

I'm curious how much of a role Infinity Fabric has to play though, as it seems like CXL has a number of the same upsides. For example:

> We also heard another nugget at the show. Imagine not just the CPU and GPU communication happening over XGMI/ Infinity Fabric. Instead, imagine a world with XGMI-connected NICs where the NIC was on the same coherent fabric. If AMD intends to extend its AI training clusters via Ultra Ethernet, then instead of having to go CPU/ GPU to PCIe with RDMA transfers over the PCIe Ethernet NIC, imagine having the XGMI NIC sitting on the Broadcom XGMI switch with the CPU and multiple GPUs. That is a fascinating concept.

CXL 3.1 was released two weeks ago, and it has support for p2p DMA, where one device transfers directly to another device. That would enable that same host-less transfer from NIC to GPU as hypothesized here. https://news.ycombinator.com/item?id=38497690 https://www.servethehome.com/cxl-3-1-specification-aims-for-...

CXL 3.1 also specified host-to-host connections. I don't know if it has anywhere near the coherency semantics Infinity Fabric has, but this is another example of the open standard having lots of overlapping capabilities with Infinity Fabric, and shows a general convergence in capabilities of these fabrics.