Similar to SMC-R, this protocol uses shared memory architectural concepts that eliminate  TCP/IP processing in the data path, yet preserve TCP/IP Qualities of Service for connection  management purposes. Support in select Linux on Z distributions is now provided for Shared Memory  Communications over Direct Memory Access (SMC-D). For more information, see this Linux  on Z Blogspot web page. The supported operating systems are listed in Table 7-8 on page 267 and Table 7-9 on  page 269.  The HiperSockets Completion Queue function is implemented on z15, z14, z13, and z13s.  This function is designed to allow HiperSockets to transfer data synchronously (if possible)  and asynchronously, if necessary. Therefore, it combines ultra-low latency with more  tolerance for traffic peaks. HiperSockets Completion Queue can be especially helpful in burst  situations. The supported operating systems are listed in Table 7-8 on page 267 and  Table 7-9 on page 269. The HiperSockets Virtual Switch Bridge is implemented on z15, z14, z13, and z13s. With the  HiperSockets Virtual Switch Bridge, z/VM virtual switch is enhanced to transparently bridge a  guest virtual machine network connection on a HiperSockets LAN segment. This bridge  allows a single HiperSockets guest virtual machine network connection to also directly  communicate with the following components: The supported operating systems are listed in Table 7-8 on page 267 and Table 7-9 on  page 269. The HiperSockets Multiple Write Facility allows the streaming of bulk data over a  HiperSockets link between two LPARs. Multiple output buffers are supported on a single  Signal Adapter (SIGA) write instruction. The key advantage of this enhancement is that it  allows the receiving LPAR to process a much larger amount of data per I/O interrupt. This  process is transparent to the operating system in the receiving partition. HiperSockets  Multiple Write Facility with fewer I/O interrupts is designed to reduce processor utilization of  the sending and receiving partitions. Support for this function is required by the sending operating system. For more information,  see “HiperSockets” on page 194. The supported operating systems are listed in Table 7-8 on  page 267. IPv6 is expected to be a key element in the future of networking. The IPv6 support for  HiperSockets allows compatible implementations between external networks and internal  HiperSockets networks. The supported operating systems are listed in Table 7-8 on page 267  and Table 7-9 on page 269. HiperSockets support of IPV6 HiperSockets Multiple Write Facility HiperSockets Virtual Switch Bridge HiperSockets Completion Queue GLYPH<SM590000> Other guest virtual machines on the virtual switch GLYPH<SM590000> External network hosts through the virtual switch OSA UPLINK port 306  IBM z15 (8561) Technical Guide