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As per info from Juniper about memory buffers here, a switch memory is divided into 2 main parts: Dedicated buffer and Shared buffer. The memory allocated for a Dedicated buffer is equally distributed among all ports, and Shared buffer memory is available for shared consumption among ports based on specific traffic types. There is also a Shared headroom buffer that is used to keep traffic received during PFC Pause time window.

I want to understand how to get the following buffer limits in SONiC OS:

  • Dedicated buffer size limit for a port
  • Shared buffer size limit for a given port's queue
  • Shared headroom size limit
Antonio
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  • Couldn't the architectures be different? There are many ways to design a system. For example, on high end cisco routers the interface buffer sizes are dynamic. – Andrew Feb 25 '22 at 17:18

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