[Tmrg] TCP evaluation suite round-table

Wesley Eddy weddy at grc.nasa.gov
Wed Sep 5 11:46:07 PDT 2007


On Wed, Sep 05, 2007 at 10:42:36AM -0700, Fred Baker wrote:
> I think you're really missing the boat if you don't test at sub- 
> megabit speeds as well. I could tell stories, like the one in Malawi  
> (deepest darkest Africa) in which a service provider that sold radio  
> links that they reduced to 64 KBPS by throwing away any traffic that  
> arrived faster than that. At least look at 2 MBPS and 256 KBPS. Your  
> TCP variant should run at the low speeds as well as the high ones.
> 


Many (most? all?) of the proposals drop back into 2581 behavior if the
cwnd is "small", so I (sort of) disagree and think it's alright to focus
on the faster rates.  I hedge that with "sort of", because I'm assuming
that all designs fall back into the well-understood legacy behavior in
low bandwidth-delay product scenarios or at least could easily be
made to do so, and I don't know if that's a faulty assumption.

-- 
Wesley M. Eddy
Verizon Federal Network Systems


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