Hi Lars,
comment in-line.
Best regards
Michael
On Sep 17, 2007, at 12:11 PM, Lars Eggert wrote:
On 2007-9-17, at 12:13, ext 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"?
For how this relates to SCTP, let me refer you to Section 6. (And
yes, there are obvious similarities here to SCTP, but also RFC2140-
like integrated congestion control, etc.)
"Prioritize" meaning how a sender allocates the available path
capacity for the SST "bundle" between connection instances. A demo
that Bryan did that showed HTTP over SST dynamically adjusted
priorities such that objects that were being rendered on the screen
were transmitted at a higher priority, even while scrolling around
a large page.
The SCTP sender can handle multiple messages in different stream send
queues in different ways.
I call the selection function the "stream scheduling function". Using
different scheduling
functions at the sender side you can get different "fairness
concepts". Message based
round robin would get the fairness concept of having the same number
of messages in each
stream, doing a weighted fair queueing based scheduler you can share
the bandwidth equally
between the different streams and so on. Priorities are also simple
to implement and have
an analysed in
http://www.cis.udel.edu/~amer/PEL/poc/pdf/sci2004-heinz-SCTP-
Prioritized-Multistreaming.pdf
The nice thing with the scheduling function is: it is a sender only
thing. The receiver has
to follow some simple rules, which almost all SCTP implementation do
anyway.
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
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