On Thu, Jan 22, 2026 at 02:31:06PM -0800, Reinette Chatre wrote:

Hi Drew,

On 1/19/26 8:14 PM, Drew Fustini wrote:

quoted

 - No MBM (bandwidth monitoring)
   - MBA schema works ok for the CBQRI-enabled memory controllers, but
     resctrl does not currently have solution for representing MBM for
     bandwidth resources that are not associated with a L3 cache.
   - For the old CBQRI proof-of-concept RFC, two separate domains were
     created for each memory controller: one for MB (allocation) and one
     for MBM (monitoring).
   - The monitoring domains had to pretend that these memory controllers
     were L3 caches which is not the case. I have removed this as it was
     too complicated and not the right solution.
   - Fenghua Yu talked about a similar problem last month at LPC in the
     resctrl BoF during the "MBA/MBM on CPU-less Memory Node" topic:
     https://lpc.events/event/19/contributions/2093/
   - I hope to work with resctrl developers on finding a solution.

Specific to this open, could you please consider [1] that proposes a way for
resctrl to handle allocation and monitoring of resources at different scope?

Thank you for pointing that out. I think that the different scope for
bandwidth monitoring would fit CBQRI well. I will reply in that other
thread.

-Drew