Chapter 3. Technical description of the hardware architecture 49
3.4.1 Thermal Power Management Device (TPMD)
The implementation of performance-aware power and thermal management for
POWER6 processor-based systems is called the EnergyScale architecture,
which meets a number of basic requirements for system-level power. IBM
BladeCenter JS23 and JS43 Express implementation uses an integrated circuit
called Thermal Power Management™ Device (TPMD), placed on the
management card.
On IBM BladeCenter JS43 Express there is only one TPMD processor, located in
the Base planar. This TPMD processor manages power consumption and
thermal conditions of both Base and MPE planars.
The TPMD card can dynamically optimize the processor performance depending
on processor power and system workload. The EnergyScale design supports a
number of power and thermal management policies.
Benchmark Benchmark maximizes the single-threaded performance
of the system by putting one core of each processor into a
low-power state, as in POWER6 the nap mode.
Maximum performance
The EnergyScale implementation regulates the system in
such a way as to use the maximum performance possible
without violating the power or thermal limits of the system.
Power cap The system is set to use a previously defined power
usage limit. Maximum power savings attempts to save as
much power as possible for a given workload.
Optimal power/performance
In this mode the EnergyScale implementation changes
the system to the most optimal power/performance
settings on the basis of workload characteristics and the
power and thermal environment.
3.5 Flexible Support Processor
Also known as the Service Processor, the Flexible Support Processor (FSP) is
integrated on the system board. It provides control busses for all major
components on the system. The FSP-1 also has a 128MB flash memory used to
store a compressed image of the system’s firmware image.
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