[e2e] How often does congestion control react upon loss?
detlef.bosau at web.de
Mon Jan 15 07:25:30 PST 2007
I apologize, if this is a beginner´s question.
During simulations with large buffers I often have several "drop bursts"
when a buffer overruns because the RTT is quite large (due to the large
buffers) and therefore it takes some time for a receiver to detect a drop.
Now I wonder (and I´m currently reading RFC 3517 to get this question
answered but perhaps someone can help me here to understand this)
whether it is possible to do several congestion actions in a round. To
my understanding it is by all means possible (and makes sense) to get
several sequence numbers in the scoreboard marked "lost" within a round.
Of course, when a sequence number is marked lost, the sender has to
retransmit the appropriate segment.
However, is the congestion window halved each time a sequence number is
recognized as "lost"? Or is there a limit, e.g. the congestion window is
halved only once a round?
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