Xeon Gold 5420+ power limit tuning

[jk123]

I'm trying to do some tuning on the Xeon Gold 5420+ (Sapphire Rapids) by modifying the package power limits by writing the MSR_PKG_POWER_LIMIT MSR. However, it seems on boot that bit 63 of this MSR is set, which locks the power limits until a reset meaning writes to the MSR are ignored. I was wondering if there is a way to stop this bit from being set on boot?

[NormanS_Intel]

Hello jk123,

Thank you for posting in the community!

To ensure you receive the most specialized assistance, we have a dedicated forum that addresses these specific concerns. Therefore, I will be moving this discussion to our Server Forum. This will allow our knowledgeable community and experts to provide you with timely and accurate solutions.

Best regards,

Norman S.

Intel Customer Support Engineer

[Sazirah]

Hi jk123,

Good day,

Regarding issue above, you may want to check on few article links below for tuning guides:

https://www.intel.com/content/www/us/en/developer/articles/guide/xeon-performance-tuning-and-solution-guides.html

https://www.intel.com/content/www/us/en/support/articles/000006804/processors.html

https://intel.github.io/intel-extension-for-pytorch/cpu/latest/tutorials/performance_tuning/tuning_guide.html

https://www.intel.com/content/www/us/en/developer/technical-library/cpu-tuning-guides.html

Let me know if you have any other questions regarding this.

Regards,

Sazzy_Intel

[Sazirah]

Hi jk123,

Good day,

This is related to your enquiries above, I would like to check if the issue has resolved?

If you have any questions or clarifications, please let me know.

Regards,

Sazzy_Intel

[Sazirah]

Hi jk123,

Good day.

Since we have not seen an update, we will be closing this forum case from our end. If you need any additional information, please submit a new question as this thread will no longer be monitored.

Regards,

Sazzy_Intel