The workload measurement results from a normalized throughput perspective are shown in  Figure 3-9. Normalized throughput is the throughput rate (in transactions per second) that are  normalized out to 100% CPU usage, which is also known as the Internal Throughput Rate  (ITR).  The normalized throughput rate shows a 25.64% increase when SMC-D is used compared to  HiperSockets, and a 10.23% increase compared to OSA 10 Gb. This results provides some  insight into CPU time savings on per-transaction basis. Customers that use an BM z13 GA2 or z13s and z/OS Version 2.2 that have Db2 workloads  (such as SQLJ IRWW) that require communication between LPARs on the same CEC, can  greatly benefit from the use of SMC-D. The combined hardware and software solution  provides improved transaction rates, significantly reduced network latency, and lower CPU  cost. With the introduction of the z13 machine, IBM implemented simultaneous multithreading  (SMT-2), which enables two active instructions per processor core. This feature can improve  the processing capacity per processor core when more than one task is running. SMT-2 is  available for workloads that are running on the Integrated Facility for Linux (IFL) and  workloads that use the z Integrated Information Processor (zIIP). SMT-2 also requires  operating system support by z/OS (for zIIP usage) and IBM z/VMfi (for IFL usage). For more information about SMT-2, see the following resources: 100  IBM Db2 12 for z/OS Performance Topics GLYPH<SM590000> z Systems Simultaneous Multithreading Revolution , REDP-5144 GLYPH<SM590000> IBM z13 Technical Guide , SG24-8251  3.3 Simultaneous multithreading Figure 3-9 Normalized throughput