[e2e] Why do we need congestion control?
Jon.Crowcroft at cl.cam.ac.uk
Sat Apr 6 03:56:03 PDT 2013
In missive <515FFA56.7060200 at web.de>, Detlef Bosau typed:
>>>> Manu, how do you want to implement fair queueing on a backbone router
>>> First, I've never claimed that I wanted to implement such mechanism=20
>>> inside the core router.
>>I see. Howver: To my understanding, fair queueing must be available on=20
>>any router in this approach?
not necessarily - see Core Stateless Fair Queueing
>>>> with actually 200.000 flows? 150.000 of them being "mice"?
>>> You talk on average not instantaneously. You only maintain a state for=20
>>> flows currently enqueued.
>>> It means that if you have a queue size of 30 packets, you can't have=20
>>> more than 30 states in your table.
>>>> At least this question should be discussed for both kind of
>>>> approaches, VJCC and DTCP.
>>> It has been already discussed for TCP, just google FairDrop and TCP.
>>>> So to my understanding, neither VJCC nor DTCP separates the problem
>>>> of resource allocation from the problem of congestion control, nor do
>>>> they eventually _solve_ the problem of (fair) resource allocation.
>>> Anyway, my ISP with CAC or DiffServ does?
>>Do we talk about fair queueing in the sense of best effort? The problem=20
>>to find the right trade off between a more or less uncontrolled system=20
>>and a QoS system here. CAC and DiffServ are clearly on the QoS side.
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