[Tmrg] TCP evaluation suite round-table

[Fred Baker]

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.

On Sep 5, 2007, at 8:46 AM, Janardhan Iyengar wrote:

> Hi Lachlan/all,
>
>> Can we agree on using
>>
>> 10Mbit/s
>> 100Mbit/s
>> 622Mbit/s
>> 1000Mbit/s
>> 2488Mbit/s
>> 10Gbit/s
>>
>> in all simulations/experiments, unless there is a reason to deviate?
>
> I second Doug's point about the endpoint becoming the bottleneck in  
> experiments. We recently did some work trying to saturate 2 GigE  
> links using 3.2 GHz Pentium-4 processors (hyperthreading OFF) with  
> jumbograms, and we recognized two bottlenecks that were very close:
> 1/ approaching CPU capacity at ends
> 2/ motherboard backplane capacity
>
> (there was also something about the PCI/PCI-express bus limits that  
> I cannot quite remember...)
>
> The backplane limit is not an unsurmountable problem, but I wanted  
> to point out that testing with bandwidths beyond 1000Mbit/s may not  
> be feasible in some cases.
>
> regards,
> - jana
>
> -- 
> Janardhan R. Iyengar
> Visiting Assistant Professor
> Connecticut College
> http://cs.conncoll.edu/iyengar/
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