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I am now doing something related to the STCP (Scalable TCP). By pringking the dynamic snd_cwnd in linux (kernel 2.6.1 ,the result puzzled me . Theoryly, if any congestion occurs, ...
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- 06-11-2010 #1
- Join Date
- Jun 2010
puzzled of the congestion control window of Scalable TCP
dynamic snd_cwnd in linux (kernel 2.6.1 ,the result puzzled me . Theoryly,
if any congestion occurs, the snd_cwnd = snd_cwnd * 0.875,but I haven't got
the result I expected. The snd_cwnd changes like this :
snd_cwnd = 1 , snd_ssthresh = 2147483647
snd_cwnd = 2 , snd_ssthresh = 2147483647
snd_cwnd = 3, snd_ssthresh = 2147483647
snd_cwnd = 19022, snd_ssthresh = 2147483647 // keeping this value for
snd_cwnd = 1769, snd_ssthresh = 16645 // congestion occurs
snd_cwnd = 1770, snd_ssthresh = 16645
From the above data. when congestion occurs , snd_ssthresh = 16645 ~=~
19022*0.875=16626 corresponds to the theory calculated result. no problems.
but what is the mean of snd_cwnd = 1770? how this value is calculated .who
(where )calculated it ?