topic how to optimize Level 2 cache in 4th gen xeon processor in Mobile and Desktop Processors

how to optimize Level 2 cache in 4th gen xeon processor

chenxj — Fri, 09 Jun 2023 05:48:53 GMT

I got the follow msg from pqos on 4th gen xeon processor, from it I can see the l2 cache also support allocation, but L2 cache is dedicate for each core, not like L3 cache is sharing with all cores, so why L2 cache support allocation, and in what circumstances it will need allocation, and what we can do to opimize it compare to 2th gen xeon processors

NOTE: Mixed use of MSR and kernel interfaces to manage
CAT or CMT & MBM may lead to unexpected behavior.
Hardware capabilities
Monitoring
Cache Monitoring Technology (CMT) events:
LLC Occupancy (LLC)
Memory Bandwidth Monitoring (MBM) events:
Total Memory Bandwidth (TMEM)
Local Memory Bandwidth (LMEM)
Remote Memory Bandwidth (RMEM) (calculated)
PMU events:
Instructions/Clock (IPC)
LLC misses
Allocation
Cache Allocation Technology (CAT)
L3 CAT
CDP: disabled
Num COS: 15
L2 CAT
CDP: disabled
Num COS: 8
Memory Bandwidth Allocation (MBA)
Num COS: 15

Re:how to optimize Level 2 cache in 4th gen xeon processor

Robert_Q_Intel — Fri, 09 Jun 2023 19:55:26 GMT

Thank you for reaching out to the Intel® Communities,

We appreciate your contacting us with your inquiry related to L2 cache allocation on Intel® Xeon® Scalable Processors.

In order to continue we would like to gather the following details in order to continue:

What is the current model of Intel® Xeon® Scalable Processor you are currently using?

Are you experiencing any issues related to the l2 cache?

What is the current OS version you running on your system?

This important information will allow us to get more details related to your environment to determine the circumstances in which the L2 cache will need allocation and also how to find ways to optimize the l2 chace.

We will be waiting for your response, in case we don't receive it we will follow up in 3 business days.

Best regards,

Robert Q.

Intel Customer Support Technician

Re:how to optimize Level 2 cache in 4th gen xeon processor

Robert_Q_Intel — Wed, 14 Jun 2023 05:57:07 GMT

Hello chenxj,

Were you able to check the previous post?

Let us know if you still need assistance.

Best regards,

Robert Q.

Intel Customer Support Technician

cant update my previous post

chenxj — Wed, 14 Jun 2023 06:02:18 GMT

https://community.intel.com/t5/Processors/how-to-optimize-Level-2-cache-in-4th-gen-xeon-processor/m-p/1495580/emcs_t/S2h8ZW1haWx8dG9waWNfc3Vic2NyaXB0aW9ufExJVkFWNTNRRzJBQVZPfDE0OTU1ODB8U1VCU0NSSVBUSU9OU3xoSw I just cant reply to my post or guys follow the post. what's the problem?

Re:how to optimize Level 2 cache in 4th gen xeon processor

Robert_Q_Intel — Fri, 16 Jun 2023 17:40:32 GMT

Hello chenxj,

Thank you for your reply

We indeed posted a follow-up on your forum, please let us know, the information was as follows:

In order to continue we would like to gather the following details in order to continue:

What is the current model of Intel® Xeon® Scalable Processor you are currently using?

Are you experiencing any issues related to the l2 cache?

What is the current OS version you running on your system?

We will be waiting for your response, in case we don't receive it we will follow up in 3 business days.

Best regards,

Robert Q.

Intel Customer Support Technician

Re:how to optimize Level 2 cache in 4th gen xeon processor

Robert_Q_Intel — Thu, 22 Jun 2023 00:18:16 GMT

Hello chenxj,

Were you able to check the previous post?

Let us know if you still need assistance.

Best regards,

Robert Q.

Intel Customer Support Technician

Re:how to optimize Level 2 cache in 4th gen xeon processor

Robert_Q_Intel — Sat, 24 Jun 2023 00:09:25 GMT

Hello chenxj,

We have not heard back from you, so we will close this thread. If you need any additional information, please submit a new question as this thread will no longer be monitored.

Best regards,

Robert Q.

Intel Customer Support Technician