Subject: RE: [Diffserv] EF with Drop ?

From: Shahram Davari <[email-masked]>
Date: Wed, 17 Nov 1999 18:18:19 -0800

Hi,

The reason of giving a higher weight than what is actually needed is to
emulate a priority scheduling. The 90% weight will make sure that almost all
incoming packets are processed immediately, while a rate controller makes
sure that only the provisioned EF BW is used. 

Note that if you use EF-PHB, you don't even need the rate controller, while
if you combine EF with EFD (EF with drop) then you need to rate control the
high drop-precedence.

Regards,
Shahram 

> -----Original Message-----
> From: demir [mailto:[email-masked]]
> Sent: Wednesday, November 17, 1999 6:08 PM
> To: Shahram Davari
> Cc: [email-masked]
> Subject: RE: [Diffserv] EF with Drop ?
> 
> 
> > I think what Juha is proposing is that to reduce the delay, 
> you could for
> > example assign 90% of the link BW to an AF class, but you 
> don't want to
> > actually use that BW (because if you do other classes will 
> get starved).
> > Let's say for example you want to use only 50% of the BW. 
> Due to this
> > artificially available BW, there will be no queue buildup, 
> and therefore you
> > can't use normal RED (which decides based on queue depth) 
> to control the BW
> > usage. So you have to control the injection rate of high 
> drop-precedence
> > traffic to the queue.
> Hi,
> Why do you assing 90% of the link BW to an AF class though 
> you want to use
> only 50% of the BW for that class? 
> I am assuming that by "you can't use RED" mean, RED is used with
> controlling the injection rate of high-drop precedence AF 
> traffic to the
> queue. why do we need to control the injection rate to the 
> queue instead
> of scheduling so that we use 50% of the BW?
> 
> Alper K. Demir
> 
> 
> 
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