Sharing memory and i/o services between nodes

A method comprising:

• generating Peripheral Component Interconnect Express (PCIe)-based packets in a first mode;
• sending the PCIe-based packets over PCIe electricals of a board during the first mode, wherein the PCIe electricals implement a PCIe physical layer of a link;
• generating flits of a different other protocol in a second mode, wherein the other protocol comprises a memory interconnect protocol;
• and
• sending the flits over the PCIe electricals of a board during the second mode.

A system comprising:

• an interconnect comprising Peripheral Component Interconnect Express (PCIe) electricals to implement a PCIe physical layer;
• a first device;
• a second device coupled to the first device via the interconnect, wherein the second device comprises:
• first protocol stack circuitry to implement at least a portion of a PCIe stack, wherein the first protocol stack circuitry is to generate packets of a PCIe-based protocol and cause the packets to be sent over the PCIe physical layer;
• and
• second protocol stack circuitry to implement at least a portion of another protocol stack, wherein the other protocol stack is to implement a memory interconnect, and the second protocol stack circuity is to generate flits of a different other protocol and cause the flits to be sent over the PCIe physical layer.