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Hi,
I am using a Xeon E5 1650 processor for my work and I have been trying to set the power limits for the DRAM through RAPL MSR's. There are no issues when I try to read the DRAM power consumption but
when I write the power limits to to MSR_DRAM_POWER_LIMIT (0x618), there is no change in the DRAM power consumption.
I tried to check the BIOS settings and I am attaching couple of images that I found. Apparently, there is an option DRAM RAPL MODE and it's value can be choses as ) Off 2) Mode 0 and 3) Mode 1.
By default, the value was Mode 1. Can anybody tell me what exactly is the difference b/w these two modes. Also, what changes do I have to do to make the DRAM power limiting work?
Thanks
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Hello kakarrot,
The BIOS sets DDR RAPL mode though BIOS-to-Pcode Mailbox command. In this case you may Set DRAM only, the power consumption of the main memory.
In regards to DRAM RAPL modes you have two options: DRAM RAPL MODE0=DRAM power from pure activity based estimation and DRAM RAPL MODE1= DRAM power from scaling activity-based estimation to match DDR VR total power (based on VR12 IOUT register)
Regards,
Caesar B.
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Hello kakarrot,
The BIOS sets DDR RAPL mode though BIOS-to-Pcode Mailbox command. In this case you may Set DRAM only, the power consumption of the main memory.
In regards to DRAM RAPL modes you have two options: DRAM RAPL MODE0=DRAM power from pure activity based estimation and DRAM RAPL MODE1= DRAM power from scaling activity-based estimation to match DDR VR total power (based on VR12 IOUT register)
Regards,
Caesar B.
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