flow on a VLAN connection over HiperSockets and between HiperSockets and OSA-Express Ethernet features. 

GLYPH<SM590000> IPv6 support on HiperSockets 

GLYPH<SM590000> HiperSockets Network Concentrator 

Traffic between HiperSockets and OSA-Express can be transparently bridged by using the HiperSockets Network Concentrator. This configuration eliminates intervening network routing overhead, which results in increasing performance and a simplified network configuration. This improvement is achieved by configuring a connector Linux system that has HiperSockets and OSA-Express connections defined to it. 

GLYPH<SM590000> HiperSockets Layer 2 support 

HiperSockets supports two transport modes on the z14 ZR1 Layer 2 (Link Layer) and Layer 3 (Network and IP Layer). 

As with Layer 3 functions, HiperSockets Layer 2 devices can be configured as primary or secondary connectors or multicast routers. These configurations enable high-performance and highly available Link Layer switches between the HiperSockets network and an external Ethernet. 

GLYPH<SM590000> HiperSockets multiple write facility 

HiperSockets performance was increased by allowing streaming of bulk data over a HiperSockets link between logical partitions. Multiple writes with fewer I/O interrupts reduce processor usage both the sending and receiving logical partitions, and is supported in z/OS. 

GLYPH<SM590000> HiperSockets Completion Queue 

The HiperSockets Completion Queue function is designed to allow HiperSockets to transfer data synchronously if possible, and asynchronously if necessary. This function combines ultra-low latency with more tolerance for traffic peaks. 

With the asynchronous support, during high volume situations, data can be temporarily held until the receiver has buffers available in its inbound queue. This function provides end-to-end performance improvement for LPAR to LPAR communication. 

GLYPH<SM590000> HiperSockets Virtual Switch Bridge Support 

The z/VM virtual switch is enhanced to transparently bridge a guest virtual machine network connection on a HiperSockets LAN segment. z/VM 6.2 or later, TCP/IP, and Performance Toolkit APARs are required for this support. 

This bridge allows a single HiperSockets guest virtual machine network connection to also directly communicate with the following devices: 

– Other guest virtual machines on the virtual switch 

– External network hosts through the virtual switch OSA UPLINK port 

GLYPH<SM590000> zIIP-Assisted HiperSockets for large messages 

In z/OS, HiperSockets was enhanced for zIIP exploitation. Specifically, the z/OS Communications Server allows the HiperSockets Multiple Write Facility processing for large outbound messages that originate from z/OS to be run on a zIIP. 

z/OS application workloads that are based on XML, HTTP, SOAP, Java, and traditional file transfer can benefit from zIIP enablement by lowering general-purpose processor usage. 

When the workload is eligible, the HiperSockets device driver layer processing (write command) is redirected to a zIIP, which unblocks the sending application. 

For more information about the technical details of each function, see IBM Z Connectivity Handbook , SG24-5444. 

