No tx-posed credit when 400G Agilex 7 FPGA writes data to host memory

[Xiaoxiao_Ma]

CPU：Intel CPU Intel(R) Xeon(R) Platinum 8457C，DDIO

FPGA：Altra Agilex 7 FPGA RDMA NIC, PCIe gen5 * 16 MaxPayload 512 bytes

RDMA write Operation

Receiver CPU：When the FPGA RDMA NIC receives data at the 400G rate, the PCIe write DDIO hits 100%, but the PCIe 1000+ clks （500MHz） does not update the credit or is intermittently not ready, and the NIC buffer starts to consume. Abnormal network behaviors such as PFC are triggered, and the bandwidth decreases. The RNIC and CPU Core are on the same NUMA node.

Are there any credit analysis tools for analyzing cpu behavior？

Thanks

[NormanS_Intel]

Hello Xiaoxiao_Ma,

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

[Simon-Intel]

Hello Xiaoxiao_Ma,

Good Day!

I'm reaching out regarding your concern that requires the attention of the FPGA team. Please get in touch with them for further support. Here's the link to connect with them: https://community.intel.com/t5/FPGA/ct-p/fpga

Best Regards, 

Simon

Intel Customer Support Technician

intel.com/vroc

[ManoranjanDas]

Hello Xiaoxiao_Ma,

Greetings from Intel!

We would like to follow up and see if you have had a chance to review the previous email we sent.

Feel free to reply to this email, and we'll be more than happy to assist you further.

Regards,

Manoranjan.

Intel Customer Support Technician

intel.com/vroc

[Xiaoxiao_Ma]

Hello Manoranjan

Thanks for your assistance！

I have solved this problem in the IPS.

Best Regards, 

Xiaoxiao Ma

[Sreelakshmi1]

Hello Xiaoxiao_Ma,

Greetings!

Thank you for the confirmation. We are glad that the issue has been fixed.

Please let us know if we can proceed with closing the request or if there are any other concerns that need to be addressed.

Regards,

Sreelakshmi

Intel Customer Support Technician

intel.com/vroc

[Fikri_Intel]

Hi Xiaoxiao_Ma,

Good day!

Since the issue is resolved, 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,

Fikri