Re: Question the other way round:

 Dear Vimal,

> Also, instead of one size fits all, you can have a hierarchical scheduler
setup:
>
> - At the top level, divide bandwidth in some fashion between class A and B
> - Class A has small buffers.
> - Class B has large buffers.
> - Flows that need low delay are directed to class A's queues.
> - Flows that need high throughput are directed to class B's queues.
>
> This way you can get a "bit" of both objectives while ensuring each class 
> gets a certain bandwidth guarantee.

  The RD (Rate-Delay) design gives a choice between two best-effort
services, one with low delay and the other with higher throughput:
"Leveraging the Rate-Delay Trade-off for Service Differentiation in
Multi-Provider Networks" by M. Podlesny and S. Gorinsky, IEEE Journal on
Selected Areas in Communications, 29(5), pp. 997-1008, May 2011,
http://fourier.networks.imdea.org/~sergey_gorinsky/pdf/JSAC_Leveraging_Rate-
Delay.pdf

  Thank you,

  Sergey