The internal shared memory (ISM) device driver provides virtual PCI devices for shared
memory communications direct (SMC-D).
ISM devices are defined in the IOCDS. Each ISM definition includes a physical network ID (PNET
ID) to associate the ISM device with Ethernet devices.
The following figure illustrates how an ISM device and a HiperSockets device are associated by a matching PNET ID. A
communication peer on the same CPC has a similarly associated pair of an ISM device and HiperSockets device. With this setup, the TCP connection can switch
over to an SMC-D connection over the SMC protocol.Figure 1. A matching PNET ID associates ISM devices and Ethernet devices
