topic Re:How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K in Mobile and Desktop Processors

How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Colin-Ian-King — Mon, 27 Apr 2026 13:47:24 GMT

I'm trying to determine the exact number of TLB entries on an Arrowlake Ultra 9 285K via cpuid but I'm not getting the correct values. What's the recommended recipe for these newer processors?

Re:How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Roy_Intel — Tue, 28 Apr 2026 13:08:00 GMT

Hi Colin-Ian-King,

Greetings from Intel Customer Support.

Thank you for posting your query on the Intel Community Forum.

Thank you for contacting us and for sharing your question regarding determining the exact number of TLB entries on the Arrow Lake Ultra 9 285K using CPUID. We understand the importance of obtaining accurate architectural information.

We would like to inform you that we are currently reviewing the details of your inquiry internally. Kindly allow us 24 to 48 business hours to investigate your question further, and we will get back to you with an update as soon as possible.

In the meantime, could you please share more details on your use case and let us know what you are looking to achieve with this information? Understanding your specific goal or application will help us investigate further and provide the most relevant guidance.

We appreciate your patience and cooperation, and look forward to your response.

Thank you for choosing Intel products and services.

Best regards,

Roy

Intel Customer Support Technician

Re:How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Roy_Intel — Tue, 05 May 2026 10:13:48 GMT

Hi Colin-Ian-King,

Greetings from Intel Customer Support.

Thank you for your patience.

As P-cores and E-cores have different TLB structures, we would like to gather some additional information to further investigate and assist you with a possible solution.

Could you please provide the following details:

The CPUID values you are currently obtaining
The expected values you believe should be returned (if available)
Details about the operating system you are using (including distribution and version)

As you mentioned using CPUID, we understand you may be working on a Linux-based system; however, we kindly request confirmation of the exact OS details to proceed accurately.

Once we have this information, we will continue our investigation and assist you further.

Thank you for your time and cooperation. We look forward to your response.

Best regards,

Roy

Intel Customer Support Technician

Re: Re:How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Colin-Ian-King — Wed, 06 May 2026 08:21:57 GMT

Hi,

Some information. I'm trying to determine the number of data TLB using just cpuid on a Intel(R) Core(TM) Ultra 9 285K. I'm using Debian Trixie as my OS, but a generic Linux solution is fine for me too.

According to various searches on the internet, the Ultra 9 285K L2 TLB has 4192 entries, not sure how I find this out from the cpuid registers. I suspect I need to probe this per cpu since it's a split P/E core design.

cpuid registers dump in ASCII plain text is attached.

Re:How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Roy_Intel — Thu, 07 May 2026 12:30:35 GMT

Hi Colin-Ian-King,

Greetings from Intel Customer Support.

Thank you for sharing the additional details regarding your query.

We would like to inform you that we are currently reviewing the details of your inquiry internally. Kindly allow us 24 to 48 business hours to investigate your question further.

We will get back to you with an update as soon as possible.

Thank you for your patience and understanding.

Best regards,

Roy

Intel Customer Support Technician

Re: How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Kevin-Foster — Sat, 09 May 2026 12:10:08 GMT

For Arrowlake Ultra 9 285K, CPUID alone may not give the full picture for TLB entries due to changes in microarchitecture reporting. You might need to cross-reference with Intel’s official documentation and performance counters. You can Read more here for a detailed guide on calculating TLB entries on newer Intel processors.

Re:How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Roy_Intel — Thu, 14 May 2026 09:42:16 GMT

Hi Colin-Ian-King,

Greetings from Intel Customer Support.

We would like to provide an update regarding your query about TLB entries for the Intel® Core™ Ultra 9 285K processor.

Currently, we do not have publicly available TLB entry documentation for this processor model. However, you may retrieve the information directly by using the CPUID leaf enumeration method.

Please refer to the following details:

TLB information is available through:
- CPUID.(EAX=0x18, ECX=subleaf)
Each subleaf describes one TLB structure.
Enumeration ends when:
- EAX = 0

How to decode the registers:

EAX:
- Indicates the TLB type and level.
EBX:
- Indicates the number of TLB entries.
Example:
- EBX = 0x600 → 1536 entries

We hope this information helps with your investigation. Please let us know if you need any further assistance.

Best regards,

Roy

Intel Customer Support Technician

Re: How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Colin-Ian-King — Tue, 19 May 2026 07:32:53 GMT

Many thanks, this is perfect!

Re:How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Roy_Intel — Tue, 19 May 2026 10:15:24 GMT

Hi Colin-Ian-King,

Greetings from Intel Customer Support.

Thank you for your confirmation. We are glad to know that the provided information was helpful for your investigation.

If your issue has been resolved, kindly confirm whether we may proceed with closing this inquiry. In case you have any additional concerns or questions, please feel free to let us know, and we will be happy to assist you further.

We appreciate your time and cooperation.

Best regards,

Roy,

Intel Customer Support Technician

Re:How do I calculate the number of TLB entries on an Arrowlake Intel(R) Core(TM) Ultra 9 285K

Roy_Intel — Thu, 21 May 2026 14:31:37 GMT

Hi Colin-Ian-King,

Greetings from Intel Customer Support. I hope you are doing well.

As we have not received a response from you, we will proceed with closing this inquiry for now. However, if you still require assistance or have any additional questions, please feel free to submit a new request, and we will be happy to assist you, as this thread will no longer be monitored.

Thank you for your understanding and cooperation.

Best regards,

Roy,

Intel Customer Support Technician