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Intel® 5000 Series Chipsets Server Board Family Datasheet
4.13.3
ThermTrip Monitoring
The BMC is responsible for persistently retaining ThermTrip history for each processor. This
history tracks whether the processor has had a ThermTrip since the last processor sensor re-
arm or retest.
When a thermal trip occurs, the BMC will poll the ThermTrip status for each processor. If the
BMC has detected that a ThermTrip occurred, then it will set the ThermTrip offset for the
applicable processor status sensor. The system hardware will then attempt to power down the
server.
4.13.4
Platform Enviroment Control Interface (PECI) Support
4.13.4.1
PECI Temperature Value
PECI temperature reading will be the current temperature reading relative to processor throttling
temperature threshold. It is always be less than or equal to 0. As the temperature of the
processor increases, the negative PECI reading will get smaller until it reaches 0 . When the
processor temperature reaches or exceeds the Prochot temperature, the PECI temperature
reading will remain at 0.
4.13.4.1.1
IPMI Sensor Support for PECI
Two temperature sensors per processor: Because these servers and workstations
must support either non-PECI or PECI processors, this will be handled by defining two
IPMI temperature sensors for each processor. One will be for PECI and one for thermal
diode physical sensors. Only two of the temperature sensors will be enabled at a time
(associated with PECI or thermal-diode), dependent on which sensor's SDR is loaded on
the system. PECI enabled processors only support the PECI SDR. When changing from
non-PECI processors to PECI processors in a system the SDR must be re-loaded to get
an accurate temperature reading.
IPMI sensor readings for PECI: IPMI processor temperature sensors that monitor
thermal-diodes provide an absolute temperature value. However, when PECI processors
are installed, the IPMI processor temperature sensors will provide relative values that
are less than or equal to 0.
Detecting PECI sensors: The PECI sensors will be a type code (01h) = temperature
and have a sensor maximum of 0 degrees C. If software needs to determine if a
temperature sensor is a PECI sensor, it should convert the sensor maximum in the SDR
and verify that the converted sensor maximum is 0 degrees C.
PECI sensor name: The PECI sensors are called Px Therm Margin on Intel S5000
systems, where the 'x' is the processor #. Example: Processor 1 would read P1 Therm
Margin.
PECI thresholds: The PECI sensor will not have any thresholds assigned to this sensor
4.13.5
PROCHOT Support
4.13.5.1
PROCHOT Temperature Sensor
On these servers and workstations, the PROCHOT sensor will be as an indication of the
amount of time the processor spends in a throttled state, over a fixed period of time. Under
normal operation, this sensor will read 0, indicating that the processor is not throttled. As the
Revision 1.1
Intel order number D38960-004
System Management
115
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