Each input queue is a unique type of workload, and has unique service and processing  requirements. The IWQ function allows z/OS to preassign the appropriate processing  resources for each input queue. This approach allows multiple concurrent z/OS processing  threads to process each unique input queue (workload), which avoids traditional resource  contention.  IWQ reduces the conventional z/OS processing that is required to identify and separate  unique workloads. This advantage results in improved overall system performance and  scalability. A primary objective of IWQ is to provide improved performance for business-critical  interactive workloads by reducing contention that is created by other types of workloads. In a  heavily mixed workload environment, this “off the  wire” network traffic separation is provided  by OSA-Express6S, OSA-Express5S, or OSA-Express4S$^{9}$ features that are defined as  CHPID type OSD. OSA IWQ is shown in Figure 7-5. The following types of z/OS workloads are identified and assigned to unique input queues: Figure 7-5 OSA inbound workload queuing (IWQ) 9 Only OSA-Express4S 1000BASE-T cards are supported on z14 as carry forward. 298  IBM z14 (3906) Technical Guide GLYPH<SM590000> z/OS Sysplex Distributor traffic: Network traffic that is associated with a distributed virtual Internet Protocol address (VIPA)  is assigned to a unique input queue. This configuration allows the Sysplex Distributor  traffic to be immediately distributed to the target host. GLYPH<SM590000> z/OS bulk data traffic: Network traffic that is dynamically associated with a streaming (bulk data) TCP connection  is assigned to a unique input queue. This configuration allows the bulk data processing to  be assigned the appropriate resources and isolated from critical interactive workloads. GLYPH<SM590000> EE (Enterprise Extender / SNA traffic): IWQ for the OSA-Express features is enhanced to differentiate and separate inbound  Enterprise Extender traffic to a dedicated input queue. The supported operating systems are listed in Table 7-8 on page 255 and Table 7-9 on  page 257.