[83687] in North American Network Operators' Group
Re: Question about propagation and queuing delays
daemon@ATHENA.MIT.EDU (Andre Oppermann)
Mon Aug 22 11:43:12 2005
Date: Mon, 22 Aug 2005 17:41:07 +0200
From: Andre Oppermann <nanog-list@nrg4u.com>
To: David Hagel <david.hagel@gmail.com>
Cc: "Robert E. Seastrom" <rs@seastrom.com>,
Richard A Steenbergen <ras@e-gerbil.net>, nanog@merit.edu
In-Reply-To: <c6ae07ec05082208144da6b29@mail.gmail.com>
Errors-To: owner-nanog@merit.edu
David Hagel wrote:
> This is interesting. This may sound like a naive question. But if
> queuing delays are so insignificant in comparison to other fixed delay
> components then what does it say about the usefulness of all the
> extensive techniques for queue management and congestion control
> (including TCP congestion control, RED and so forth) in the context of
> today's backbone networks? Any thoughts? What do the people out there
> in the field observe? Are all the congestion control researchers out
> of touch with reality?
Queueing is only ever being used when there is something to queue.
In the optical backbones of today this is seldomly the case and all
operators are busy telling you there is always excessive bandwidth
available on theirs. It gets used whenever a downward speedchange
happens: 1Gig -> 100M for example.
--
Andre
