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FW: EF% vs. BCN

 
-----Original Message-----
From: Raj Sharma
Sent: Thursday, August 17, 2000 8:40 AM
To: 'Khaled Amer'
Subject: RE: EF% vs. BCN

EF packets have to shipped immediately.
That is a rule. So, unless ALL EF packets are shipped
the rest of the packets cannot be shipped out.
As every node introduces EF traffic the length of EF
"bursts" will be longer downstream. So, per time quantum
you will have one part which sees heavy EF traffic and the other
times no EF traffic. When you "sample" or indicate congestion
can be tricky !
 
-----Original Message-----
From: Khaled Amer [mailto:khaledamer@xxxxxxx]
Sent: Thursday, August 17, 2000 10:29 AM
To: Raj Sharma; Reflector RPRSG
Cc: Vinay Bannai; Sanjay Agrawal; Charles Barry
Subject: Re: EF% vs. BCN

Raj,
 
Not sure I understand how you reached to the conclusion of 'the traffic at any node would be a periodic function'.
 
Can you shed some light on this?
 
Khaled Amer
President, AmerNet               
Architecture Analysis and Performance Modeling Specialists
Phone: (949)552-1114             13711 Solitaire Way, Irvine, CA 92620
Fax:     (949)552-1116             e-mail: khaledamer@xxxxxxx
 

 
----- Original Message -----
From: Raj Sharma
Sent: Wednesday, August 16, 2000 9:36 AM
Subject: EF% vs. BCN

I would like to findout if anyone has given
thought to Explicit Forward (EF) traffic versus BCN mechanisms
used on buffer insertion rings.
 
Assume that x% of the BW is provisioned for EF.
As EF traffic into the ring it will given highest priority
forwarding and hence to culminate in all EF packets
arriving together. The BW consumed by EF traffic over
time can become a time function.
Example x(t) = sine or square wave function of t with an amplitude
of x.
 
As a consequence available BW for the rest of the traffic
at any node can become a periodic function. There could be interplay
between this perdiodicity and the periodicity of the congestion
notification messages.
 
Has anyone simulated this or have given thought to
this?