Re: session layers, was Re: Renumbering ... Should we consider an assoc

I am afraid that I must agree with Fred.  There is nothing very new 
in this paper and its publication is merely another indication of how 
far down the blind alley we have gone.  I was surprised SIGCOMM even 
published dressing up X.25 Fast Select with fancy words.  Amazing.
At 2:13 -0700 2007/09/17, Fred Baker wrote:
> Dumb question of the month. With the exception of the last claim 
> ("...can prioritize..."), this could just as easily describe SCTP. 
> What here is new? And define "prioritize"?
> On Sep 17, 2007, at 2:02 AM, Lars Eggert wrote:
> > You might be interested in Bryan Ford's SST paper from this year's SIGCOMM:
> >
> > Structured Streams: a New Transport Abstraction. Bryan Ford. ACM 
> > SIGCOMM 2007, August 27-31, 2007, Kyoto, Japan. 
> > http://www.brynosaurus.com/pub/net/sst-abs.html
> > Abstract: Internet applications currently have a choice between 
> > stream and datagram transport abstractions. Datagrams efficiently 
> > support small transactions and streams are suited for long-running 
> > conversations, but neither abstraction adequately supports 
> > applications like HTTP that exhibit a mixture of transaction sizes, 
> > or applications like FTP and SIP that use multiple transport 
> > instances. Structured Stream Transport (SST) enhances the 
> > traditional stream abstraction with a hierarchical hereditary 
> > structure, allowing applications to create lightweight child 
> > streams from any existing stream. Unlike TCP streams, these 
> > lightweight streams incur neither 3-way handshaking delays on 
> > startup nor TIME-WAIT periods on close. Each stream offers 
> > independent data transfer and flow control, allowing different 
> > transactions to proceed in parallel without head-of-line blocking, 
> > but all streams share one congestion control context. SST supports 
> > both reliable and best-effort delivery in a way that semantically 
> > unifies datagrams with streams and solves the classic "large 
> > datagram" problem, where a datagram's loss probability increases 
> > exponentially with fragment count. Finally, an application can 
> > prioritize its streams relative to each other and adjust priorities 
> > dynamically through out-of-band signaling. A user-space prototype 
> > shows that SST is TCP-friendly to within 2%, and performs 
> > comparably to a user-space TCP and to within 10% of kernel TCP on a 
> > WiFi network.
> > Lars_______________________________________________
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