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Figure 3-3 shows how to choose a processor compatibility mode from IVM.
Figure 3-3 Configuring partition profile compatibility mode from IVM
Table 3-2 lists the differences between these modes.
Table 3-2 Differences between POWER6 and POWER7 mode
POWER6 and POWER6+ mode
2-thread SMT
VMX (Vector Multimedia Extension
or AltiVec)
Affinity OFF by default
Barrier Synchronization
Fixed 128-byte Array; Kernel
Extension Access
64-core and 128-thread scaling
EnergyScale CPU Idle
3.4 PowerVM
The PowerVM platform is the family of technologies, capabilities, and offerings that deliver
industry-leading virtualization on the IBM Power Systems. Leading technologies such as
Logical Partitioning, Micro-Partitioning™, POWER Hypervisor, Virtual I/O Server (VIOS),
POWER7 mode
4-thread SMT
VSX (Vector Scalar Extension)
3-tier memory, micro-partition Affinity
Enhanced Barrier Synchronization
Variable Sized Array; User Shared
Memory Access
32-core and 128-thread scaling
64-core and 256-thread scaling
256-core and 1024-thread scaling
EnergyScale CPU Idle and Folding with
NAP and SLEEP
Customer value
Throughput performance, processor
core utilization.
High performance computing for
graphic and scientific workload.
Improved system performance for
system images spanning sockets and
nodes.
High performance computing parallel
programming synchronization facility.
Performance and Scalability for Large
Scale-Up Single System Image
Workloads (such as OLTP, ERP
scale-up, WPAR consolidation).
Improved Energy Efficiency.
Chapter 3. Virtualization
97
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