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[Diffserv-interest] MRED algorithms under DiffServ - s parameter computation

"Sergio Andreozzi" <sergio.andreozzi@lut.fi> Mon, 24 September 2001 13:15 UTC

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From: Sergio Andreozzi <sergio.andreozzi@lut.fi>
To: "Ns-Users@Isi. Edu" <ns-users@isi.edu>, DS implementation mailing list <dsimplementation@atnf.CSIRO.AU>, Diffserv-Interest mailing list <diffserv-interest@ietf.org>
Date: Mon, 24 Sep 2001 15:39:35 +0300
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Subject: [Diffserv-interest] MRED algorithms under DiffServ - s parameter computation
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Hi!

MRED algorithms are based on RED. In this, to compute average queue lenght
when a packet enters an empty queue, the s parameter have to be computed (s
in the Floyd paper, 1/PTC in ns implementation - DiffServ module).
m is "the number of packets that might have been transmitted by the gateway
during the time that the line was free" and s is "a typical transmission
time for a small packet".

My question is:

e.g.
I have an outgoing link of 10 Mbit/s in a DiffServ enabled router. An AF PHB
is configured to have 2 Mbit/s of bandwidth and a MRED mechanism is applied
to it.
How should I compute s? Should I consider 10 Mbit/s or 2 Mbit/s? (I guess 2
Mbit/s, but in ns 10 Mbit/s is considered).

Thanks


Sergio


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