[e2e] Difference wired, wireless, was: Re: Taking RTT Samples.

Detlef Bosau detlef.bosau at web.de
Sat Aug 20 03:26:44 PDT 2011

On 08/16/2011 05:55 PM, Mark Allman wrote:
>> I'm curious whether we  shall take RTT Samples for each segment or
>> not. AFAIK, the RFC encourage one RTT timer, which is started at
>> least once a round.
>> An alternative way would be one timer per segment.
> Our work suggests that multiple samples per RTT does not help the
> estimator.
> See:
>    Mark Allman, Vern Paxson.  On Estimating End-to-End Network Path
>    Properties.  Proceedings of the ACM SIGCOMM Technical Symposium,
>    Cambridge, MA, September 1999.
>    http://www.icir.org/mallman/papers/estimation.ps
> allman

So, in general we can assume: In wired internetworks, we have reasonable 
RTT/RTO estimators.

Now, when it comes to WWAN, which is basically my central interest, will 
these mechanisms still hold?

And do we have evidence for or against this?


Detlef Bosau
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