RAPL PP0 supported but not enabled

[naposto]

Hi all,

I have been trying to fetch RAPL measurements from my Intel's server. The model of my server is:

$ cpuid -l 1 -1 | head -n 11

CPU:
version information (1/eax):
processor type = primary processor (0)
family = 0x6 (6)
model = 0x5 (5)
stepping id = 0x7 (7)
extended family = 0x0 (0)
extended model = 0x5 (5)
(family synth) = 0x6 (6)
(model synth) = 0x55 (85)

$ cpuid -l 1 -1 -- raw

... eax=0x00050657

According to some online resources [1,2], PP0 should be supported.

However, when I am trying to retrieve the RAPL measurements from 

#define MSR_PP0_ENERGY_STATUS		0x00000639

value 0 is always returned. 

$ rdmsr 0x639

0

Only Package and DRAM domains are seen from my system: Also the perf command doesn't show the power/energy-cores Kernel PMU event.

$ perf list | grep energy-
power/energy-pkg/ [Kernel PMU event]
power/energy-ram/ [Kernel PMU event]

Is it disabled somehow from my system? Is it a BIOS option? 

Thanks a lot! 

References:

[1] https://web.eece.maine.edu/~vweaver/projects/rapl/rapl_support.html

[2] https://github.com/intel/powergov/blob/cdfd69c063db50679b8dd453067c889f24a219dc/rapl.c#L210

[IntelSupport]

Hello Naposto,

Greetings for the day!

Thank you for posting in Intel community forum.

To proceed further, kindly share the system information and processor model that you are using.

Regards,

Sreelakshmi B

[naposto]

Hi, 

$ lscpu

Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 48 bits virtual
CPU(s): 64
On-line CPU(s) list: 0-63
Thread(s) per core: 2
Core(s) per socket: 16
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 6226R CPU @ 2.90GHz

....

$ uname -r 

5.4.0-167-generic

$ lsb_release -a 

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.4 LTS
Release: 20.04
Codename: focal

[IntelSupport]

Hello Naposto,

Greetings for the day!

Thank you for the response.

We request you to help us with the Intel server model that you are using.

Regards,

Sreelakshmi B

[naposto]

Intel(R) Xeon(R) Gold 6226R CPU @ 2.90GHz (Cascade Lake)

https://www.intel.com/content/www/us/en/products/sku/199347/intel-xeon-gold-6226r-processor-22m-cache-2-90-ghz/specifications.html

[IntelSupport]

Hello Naposto,

Thank you for your response.

We are checking the details from our end and kindly allow us some time to get back to you .

Regards,

Sreelakshmi B

[IntelSupport · Accepted solution]

Hello Naposto,

Greetings for the day!

Please be informed that the RAPL is already enabled on all XEON Sapphire Rapids.

We would like to inform that for management of RAPL you can use Intel® Speed Select Technology - Core Power (Intel® SST-CP) which is the fundamental building block that enables the Intel® SST-BF and Intel® SST-TF features. It is also a standalone feature on its own that can be used without Intel® SST-BF or Intel® SSTTF.

Intel® SST-CP is also known as "RAPL Prioritization".

Please check the below links for more details.

 Item 10.9 from Intel® Speed Select Technology – Core Power

 Running Average Power Limit Energy Reporting CVE-2020-8694,... (intel.com)

We would like to inform you that the Xeon 4th Gen Scalable does not have Ubuntu 20.04 as a compatible and tested OS. Issues could happen on the OS level, as they are not tested with this distribution.

Regards,

Sreelakshmi B

[naposto]

Hi, which are the compatible/tested OSes for Xeon 4th Gen Scalable?

[IntelSupport]

Hello Naposto,

Thank you for your response.

Kindly follow the below link for Operating System Compatibility and Intel® Xeon® Scalable Processors.

https://www.intel.com/content/www/us/en/support/articles/000055440/processors/intel-xeon-processors.html

Regards,

Sreelakshmi B

[IntelSupport]

Hello Naposto,

Greetings for the day!

We are following up to find out if you were able to find the information we provided . Please reply to confirm, so we can continue helping on a resolution. Looking forward to receiving your reply.

Regards,

Sreelakshmi B

[IntelSupport]

Hello Naposto,

Greetings for the day!

We would like to inform you that we are closing this request as no response has been received from our previous follow-ups.

Please don't hesitate to ask any further questions in the future. Feel free to start a new conversation, as this thread will no longer be monitored.

Regards,

Sreelakshmi B