RFNoC4.0 endpoint buffer size

[hakegit]

I have some issues when using RFNoC4.0. When I was using RFNoC3.0, I needed to input a series of modules make by myself when building an image using IMAGE_BUILDER.py. When I am using RFNoC4.0, I need to input the modules in the image_core.yml. The problem is that my own modules need a large amount of BRAM in FPGA. When I am using RFNoC3.0, if I use more than four my own modules, building failure will arise, which is clearly due to insufficient BRAM. But when I use RFNoC4.0, I need to determind the buffer size of ENDPOINT (ep) in image_core.yml for each module when creating an image .And the connection need to be written by myself ,too. So I don't know how the BRAM used by my module corresponds to the cache size specified by me for ep. That is, how do I set the cache size for ep so that when my own module is added between ddc and radio, and between radio and duc. Currently, I am constantly trying to set the cache size of different EPs to different sizes, which may lead to issues with OOOOO or UUUUUU. I hope developers can provide me with a detailed explanation of how to set the cache size when my own module requires a large BRAM (approximately 8000 complex floating numbers). The specific names of my two own modules are sig1 and sig2. Each module requires a cache area of 8192 complex floating-point numbers.
My module connection methods are radio-sig2-ddc-ep and ep-duc-sig2-radio, with two identical links for sending and receiving. I would greatly appreciate it if I could receive guidance.

[wordimont]

I suggest that you use static connections for the topology you need. You can experiment with the stream endpoint size (it's a balance between resource usage and streaming performance, so there's no one right answer). I suggest you also remove the parts of the RFNoC image that you're not using (extra radio blocks or ports, perhaps the replay block).

A few references that might be useful:

• https://kb.ettus.com/Getting_Started_with_RFNoC_in_UHD_4.0
• https://kb.ettus.com/RFNoC_Frequently_Asked_Questions#Configuring_the_Stream_Endpoint_Buffer_Size_in_RFNoC
• https://kb.ettus.com/RFNoC_Frequently_Asked_Questions#My_design_doesn.27t_fit_in_the_FPGA._What_can_I_do_to_reduce_the_size.3F

If you have additional questions, I suggest using the usrp-users mailing list which has a broader audience than GitHub issues.

https://kb.ettus.com/Mailing_Lists