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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