topic Re:Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors in Mobile and Desktop Processors

Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

ndsf — Tue, 26 Sep 2023 07:23:54 GMT

Dear Intel Community,

I have a question regarding the errata identified as "CLX1. Intel® CAT/CDP Might Not Restrict Cacheline Allocation Under Certain Conditions" in the "2nd Gen Intel® Xeon® Scalable Processors Specification Update" document and Intel® Resource Director Technology (Intel® RDT) Reference Manual.

The errata is shown as below.

CLX1. Intel® CAT/CDP Might Not Restrict Cacheline Allocation Under Certain
Conditions (Intel® Xeon® Processor Scalable Family)
Problem: Under certain micro architectural conditions involving heavy memory traffic, cache lines might fill outside the allocated L3 Capacity Bitmask (CBM) associated with the current Class of Service (CLOS).
Implication: Cache Allocation Technology/Code and Data Prioritization (CAT/CDP) might see performance side effects and a reduction in the effectiveness of the CAT feature for
certain classes of applications, including cache-sensitive workloads than seen on
previous platforms.
Workaround: None identified.
Status: For the steppings affected, refer to the Summary Tables of Changes.

I would like to inquire whether Intel has addressed or plans to fix this errata in the successor products of the 2nd Gen Intel® Xeon® Scalable Processors. I have tested that this problem still exists on Intel(R) Xeon(R) Gold 6348 CPU (3rd Gen Intel® Xeon® Scalable Processors), but the errata is not found in 3rd Gen Intel® Xeon® Scalable Processors, Codename Ice Lake Specification Update.

Any information or insights you can provide regarding this matter would be highly appreciated. Thank you in advance for your assistance and support!

Re:Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

IntelSupport — Thu, 28 Sep 2023 12:07:17 GMT

Hello ndsf,

Greetings for the day!

This is regarding the case you have with us with the following details.

Case No. 05997248

Product: Processors

Issue: Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

We are currently in the process of reviewing the information you have provided, and we will promptly update you once we have the necessary details. We kindly request your cooperation during this time.

Please don’t hesitate to contact us for any further assistance.

Thank you for using Intel products and services.

Best Regards,

Sreelakshmi B

Intel Customer Support.

Re:Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

IntelSupport — Mon, 02 Oct 2023 09:40:33 GMT

Hello ndsf,

Greetings for the day!

This is regarding the case you have with us with the following details.

Case No. 05997248

Product: Processors

Issue: Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

We would like to notify you that, based on the documentation, Intel has no plans of fixing this errata, as confirmed by our engineering team. Additionally, please be aware that this erratum does not impact the longevity of the unit.

Furthermore, we would like to highlight that this same errata is not present in the 3rd Gen Xeon Scalable Processor. You can find more details in the reference link provided below.

https://www.intel.com/content/www/us/en/content-details/637780/3rd-gen-intel-xeon-scalable-processors-codename-ice-lake-specification-update.html?wapkw=3rd%20xeon%20errata

Please don’t hesitate to contact us for any further assistance.

Thank you for using Intel products and services.

Best Regards,

Sreelakshmi B

Intel Customer Support.

Re:Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

IntelSupport — Mon, 09 Oct 2023 08:28:49 GMT

Hello ndsf,

Greetings for the day!

This is regarding the case you have with us with the following details.

Case No. 05997248

Product: Processors

Issue: Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

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

Please don’t hesitate to contact us for any further assistance.

Thank you for using Intel products and services.

Best Regards,

Sreelakshmi B

Intel Customer Support.

Re:Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

IntelSupport — Fri, 13 Oct 2023 11:21:33 GMT

Hello ndsf,

Greetings for the day!

This is regarding the case you have with us with the following details.

Case No. 05997248

Product: Processors

Issue: Inquiry about Errata CLX1 of Intel® CAT/CDP in 2nd Gen Intel® Xeon® Scalable Processors

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.

Please don’t hesitate to contact us for any further assistance.

Thank you for using Intel products and services.

Best Regards,

Sreelakshmi B

Intel Customer Support.