[e2e] TCP to exhibit MTU unfairness?

[Detlef Bosau]

Lachlan Andrew wrote:
> Greetings Detlef and Daniel
>
> I think Daniel was pointing out that current TCP sets the window in
> terms of number of MTUs, 

??

Excuse me, if I have something wrong in mind, but isn´t the window given 
in bytes?
Or does this depend on the TCP flavour?


> and hence gives bandwidth proportional to the
> MTU of a flow.  Flows using MTU=100 get roughly 1/15 of the bandwidth
> of flows using MTU=1500.
>
> Some people argue that this is correct behaviour if the actual
> bottleneck is the "packet per second" forwarding limit of a router,
> rather than the link capacity.  However, I think that Daniel is right
>   

Hm. I read the congavoid paper again and again and to my understanding, 
the fairness issue tackled by congestion control is a _capacity_ issue....


> that it is  normally  undesirable unfairness.
>
>   

If the window is given in MTU size units, I agree.

Detlef
> Cheers,
> Lachlan
>
> On 12/11/2007, Detlef Bosau <Detlef.Bosau at web.de> wrote:
>   
>>> Dear Community,
>>>
>>> I was wondering if there is something like "MTU unfairness"...
>>> similar to the probably not existing "RTT unfairness".
>>>       
>> My basic question is: What is the ressource to be shared?
>>
>> In TCP, the shared ressource is storage capacity along the path. The actual MTU size of a flow does not matter in this context.
>> So, it is not yet clear to me what you mean by "MTU (un)fairness" or "RTT (un)fairness".
>>
>>
>> Detlef
>>
>>
>>     
>
>
>   


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