The blocking algorithm is modified based on the following application requirements: GLYPH<SM590000> For latency-sensitive applications, the blocking algorithm is modified considering latency. GLYPH<SM590000> For streaming (throughput-sensitive) applications, the blocking algorithm is adjusted to  maximize throughput. In all cases, the TCP/IP stack determines the best setting based on the current system and  environmental conditions, such as inbound workload volume, processor utilization, and traffic  patterns. It can then dynamically update the settings.  Supported OSA-Express features adapt to the changes, which avoids thrashing and frequent  updates to the OAT. Based on the TCP/IP settings, OSA holds the packets before presenting  them to the host. A dynamic setting is designed to avoid or minimize host interrupts. OSA Dynamic LAN idle is supported by the OSA-Express7S, OSA-Express6S, and  OSA-Express5S features on z15 when in QDIO mode (CHPID type OSD). The supported  operating systems are listed in Table 7-8 on page 267. OSA Layer 3 virtual MAC for z/OS environments To help simplify the infrastructure and facilitate load balancing when an LPAR is sharing an  OSA MAC address with another LPAR, each operating system instance can have its own  unique logical or virtual MAC (VMAC) address. All IP addresses that are associated with a  TCP/IP stack are accessible by using their own VMAC address instead of sharing the MAC  address of an OSA port. This situation also applies to Layer 3 mode and to an OSA port  spanned among channel subsystems. OSA Layer 3 VMAC is supported by the OSA-Express7S, OSA-Express6S, and  OSA-Express5S features on z15 when in QDIO mode (CHPID type OSD). The supported  operating systems are listed in Table 7-8 on page 267. Network Traffic Analyzer The z15 offers systems programmers and network administrators the ability to more easily  solve network problems despite high traffic. With the OSA-Express Network Traffic Analyzer  and QDIO Diagnostic Synchronization on the server, you can capture trace and trap data.  This data can then be forwarded to z/OS tools for easier problem determination and  resolution. The Network Traffic Analyzer is supported by the OSA-Express7S, OSA-Express6S, and  OSA-Express5S features on z15 when in QDIO mode (CHPID type OSD). The supported  operating systems are listed in Table 7-8 on page 267. 7.4.6 Cryptography Features and Functions Support IBM z15™ provides the following major groups of cryptographic functions: GLYPH<SM590000> Synchronous cryptographic functions, which are provided by CPACF GLYPH<SM590000> Asynchronous cryptographic functions, which are provided by the Crypto Express7S  feature The minimum software support levels are described in the following sections. Review the  current PSP buckets to ensure that the latest support levels are known and included as part  of the implementation plan. Chapter 7. Operating system support  315