Re: [OPENETLAB] Question: Oplets and Accelar Queue Mgt./Routing

[Muneyb Minhazuddin <Muneyb.Minhazuddin@tip.csiro.au>]

> Hi All,
> 
> I am playing with an idea of influencing Accelar Forwarding from Oplets.
> I am looking at an algorithm which is an extension to RED. I wonder if I
> can implement it as an Oplet and combine it with Accelar IPfilter
> setting to influence Accelar Packet forwarding.
> 
> My initial investigation suggests that this is not possible. Here is
> why. This algorithm, like any other queue management algorithm, includes
> the just arrived packet in a computation to decide if the packet should
> be dropped or queued. If this computation happens in an Oplet, it is
> essentially happening outside the Accelar forwarding path. Given current
> Accelar filter actions, one can either choose to drop or forward a
> packet (besides getting a copy of it, etc.) One cannot pull a packet
> out, do computations and then give it back to Accelar forwarding engine.

> (I know, it will radically slow the engine down.) So, such a queue
> management algo has to be part of the Accelar forwarding mechanism.

That is right.

> Is my inference correct or is it still possible to implement such a
> scheme through Oplets? 

My understanding is that Oplets provide services. If you have any specific
forwarding rules that you want to write using an oplet into the forwarding
path you would make use of JFWD. 

RED implementation would have to be hardcoded, however ability to pass
parameters like max threshold, min threshold, burst, probability of drop
using a mapping from JFWD is probably prefered. 

>Does Accelar support RED queues?
> 

Cheers
Muneyb
_________________________________________________________
Muneyb Minhazuddin - Telecommunications Research Engineer    
CSIRO Telecommunications and Industrial Physics                
Sydney, NSW, Australia.                                    
                                                             
Phone no. : 61 2 9372 4113
FAX       : 61 2 9372 4490          
e-mail    : mminhazu@tip.csiro.au  
Home Page : http://www-networks.tip.csiro.au/~mminhazu
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