[Ns-bugs] [Bug 1351] New: TCP not able to take RTT samples on long delay network
code at nsnam.ece.gatech.edu
Mon Jan 30 06:51:48 PST 2012
Summary: TCP not able to take RTT samples on long delay network
AssignedTo: adrian.sw.tam at gmail.com
ReportedBy: tomh at tomh.org
CC: ns-bugs at isi.edu
Estimated Hours: 0.0
(reported here on ns-3-users list:
I was using NS to test TCP congestion control variants. Since last week decided
to migrate from NS-3.10 to NS-3.13.
On NS-3.13 I am having several problems with the evolution of the TCP's
congestion window (the results are totally different in NS-3.10 and NS-3.13).
As far i could see when there is high delay (250 ms or more) on the simulated
network TCP is not able to take RTT samples, and due to this is not able to
calculate RTT estimation and the RTO (congestion window is restarted to 1MSS
The network i have been simulating is simple:
n0 ============== n2 ---------------- n2 ============== n1
csma p2p csma
n0 is the source node (onoffapplication)
n2 and n3 acts as router and implements droptail queue , p2p delay is set to
n3 is the sink node (sink application)
Attached to the email are the graph of the congestion window on n0 for NS-3.10
Is there any bug related to RTT calculation for NS-3.13?
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