[e2e] Comparing Linux qdiscs in lab conditions (paper)

Detlef Bosau detlef.bosau at web.de
Fri Feb 8 16:35:32 PST 2013

Admittedly, I did not follow the whole discussion in its ramifications. 
What I still wonder about, not only in the context of buffer bloat, is 
that I frequently find the claim, the "bottleneck" of a TCP flow would 
be located on edge routers and not on core routers. And that's the 
central point I simply don't buy.

The question may be often asked, but do we really know, where packets 
pile up and which routers suffer from buffer bloat? Particularly in the 
paper by Van Jacobson and Kathleen Nichols, I find quite some remarks on 
CoDel on edge routers. I simply see no sense in placing AQM algorithms 
on edge routers. When I, living in Stuttgart, download a huge file from 
some server in Boston, it is almost sure that my ADSL router is 
definitely not the bottleneck.

Generally, when queues grow too large on core routers, why don't we 
manage queues there?

Perhaps, this is a general misconception of mine, however: why don't we 
fight buffer bloat where it occurs?


Detlef Bosau
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The nonsense that passes for knowledge around wireless networking,
even taught by "professors of networking" is appalling.  It's the
blind leading the blind. (D.P. Reed, 2012/12/25)

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