RE: [Diffserv] Model - queues (second draft)

[Shahram Davari <Shahram_Davari@xxxxxxxxxxxxxx>]

Hi Dan,

Please see comments:

> -----Original Message-----
> From: Dan Grossman [mailto:dan@noah.dma.isg.mot.com]
> Sent: Thursday, January 06, 2000 11:28 AM
> To: Shahram Davari
> Cc: 'Dan Grossman'; Andrew Smith; diffserv@ietf.org
> Subject: Re: [Diffserv] Model - queues (second draft) 
> 
> 
> > 1) Although you mention that a FIFO is identified by its depth,
> > threshold,... But in your FIFO examples there is no Depth 
> parameter. So I
> > suggest adding it to the example.
> The depth is a variable, not a configuration parameter.  I'll 
> add clarifying 
> text.

Agreed. My mistake, I was thinking about the MAX-depth, which of course can
be configured using one of the thresholds.

> > 
> > 2) You mention that a FIFO can have more than one input. I 
> think if there
> > are more that one inputs, then there should be another 
> element (i.e.,
> > scheduler elements such as FCFS or MUX) before the FIFO. So 
> I suggest
> > changing the text to "A FIFO has one input and one output, 
> but if more that
> > one input are required for a FIFO they have to pass through 
> a scheduler
> > element".
> > 
> I thought about this and don't agree.  It would be common, 
> for example to have 
> more than one classifier feeding the same queue.  If the flow 
> of packets is 
> assumed to be serial, there is no scheduler element required.

In case of serial packet flow, the multiple inputs can be directly connected
to a single line like following:

In1 -------|
In2 -------|-------> FIFO ---->
In3 -------|

So I think there is no need to include this as part of the FIFO model,
because it will generate confusion in case of non-serial packet flows.

> > 3) I think your "priority" part requires some work. I will 
> try to work on
> > it.
> I've incorporated Andrew's text. Hope that works for you.
> 
> Will send the updated text to the list shortly.
> > 
> 

Great.

-Shahram

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