[e2e] TCP Local Area Normal behaviour? any references?

Christian Huitema huitema at windows.microsoft.com
Fri Jan 21 20:37:33 PST 2005


> Since you folks are talking about it, I thought I'd point out to a
paper
> we wrote on the topic. Here is the URL:
> http://www.research.att.com/~kkrama/papers.html#capture_effect
> Of course as you folks mention, full-duplex Ethernet makes this
problem
> less
> relevant in LANs. But, it is still relevant in other domains, such as
in
> Wireless LANs.

Capture effects affect fairness, not throughput. In fact, by allowing a
pair of stations to jump on the channel faster, capture effects enhance
the throughput.

That being said, there are pretty few shared media Ethernet around
nowadays. The closest thing is a 10baseT hub, and that is already a
pretty ancient piece of equipment. Most wired LAN are built out of
Ethernet switches. Switches are by and large immune to the capture
effect. On 1Gbps switches, sustained TCP rates of around 800 Mbps are
common. 

-- Christian Huitema


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