Intel CM8062101038606, E5-4600 Dram Thermal Estimation Configuration Data Read/Write, Limit Data

Table 2-6. RdPkgConfig() & WrPkgConfig() DRAM Thermal and Power Optimization Services Summary (Sheet 2 of 2)

	Index	Parameter	RdPkgConfig()	WrPkgConfig()		Alternate Inband
Service	Value	Value	Data	Data	Description	MSR or CSR
	(decimal)	(word)	(dword)	(dword)		Access
DRAM Power						MSR 618h:
Limit Data				DRAM Plane	Write DRAM	DRAM_POWER_LIMIT
Write / Read	34	0x0000	N/A			CSR:
				Power Limit Data	Power Limit Data
						DRAM_PLANE_POWER_LIM
						IT
DRAM Power						MSR 618h:
Limit Data			DRAM Plane Power		Read DRAM	DRAM_POWER_LIMIT
Write / Read	34	0x0000		N/A		CSR:
			Limit Data		Power Limit Data
						DRAM_PLANE_POWER_LIM
						IT
DRAM Power					Read sum of all
Limit			Accumulated DRAM		time durations	CSR:
Performance	38	0x0000		N/A	for which each
			throttle time			DRAM_RAPL_PERF_STATUS
Status Read					DIMM has been
					throttled

Notes:

1.Time, energy and power units should be assumed, where applicable, to be based on values returned by a read of the PACKAGE_POWER_SKU_UNIT MSR or through the Package Power SKU Unit PCS read service.

2.5.2.6.2DRAM Thermal Estimation Configuration Data Read/Write

This feature is relevant only when activity-based DRAM temperature estimation methods are being utilized and would apply to all the DIMMs on all the memory channels. The write allows the PECI host to configure the ‘β’ and ‘θ’ variables in Figure 2-12for DRAM channel temperature filtering as per the equation below:

TN = β ∗ TN-1+ θ ∗ ΔEnergy

TN and TN-1are the current and previous DRAM temperature estimates respectively in degrees Celsius, ‘β’ is the DRAM temperature decay factor, ‘ΔEnergy’ is the energy difference between the current and previous memory transactions as determined by the processor power control unit and ‘θ’ is the DRAM energy-to-temperature translation coefficient. The default value of ‘β’ is 0x3FF. ‘θ’ is defined by the equation:

θ= (1 - β) ∗ (Thermal Resistance) ∗ (Scaling Factor)

The ‘Thermal Resistance’ serves as a multiplier for translation of DRAM energy changes to corresponding temperature changes and may be derived from actual platform characterization data. The ‘Scaling Factor’ is used to convert memory transaction information to energy units in Joules and can be derived from system/memory configuration information. Refer to the Intel® 64 and IA-32 Architectures Software Developer’s Manual (SDM) Volumes 1, 2, and 3 for methods to program and access ‘Scaling Factor’ information.

Figure 2-12. DRAM Thermal Estimation Configuration Data

31		20	19	10	9		0
	RESERVED			THETA VARIABLE		BETA VARIABLE

Memory Thermal Estimation Configuration Data

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