Peter,

> I'm aware of the PD layer and that is not the issue. The problem is that 
> there is no common value to report across different PD layers, as each 
> architecture may have different number of queues involved, etc. Trying to 
> find a common value to report to IPGs across various PDs would involve some 
> PD specific logic and that is the part I'm referring to and I would like NOT 
> to get into.


I’m sorry that scares you.  It would seem like an initial implementation might 
be to take the min of the free space of the queues leading from the interface 
to the CPU. I grant you that some additional sophistication may be necessary, 
but I suspect that this is not going to become more complicated than polynomial 
evaluation. 

Tony

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