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Date: Thu, 10 Jun 2010 18:20:21 -0700 (PDT) From: jellyaaa <wgdaaa@....com> To: netdev@...r.kernel.org Subject: puzzled of the congestion control window of Scalable TCP I am now doing something related to the STCP (Scalable TCP). By printking the dynamic snd_cwnd in linux (kernel 2.6.18) ,the result puzzled me . In theory, if any congestion occurs, the snd_ssthresh = 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 several ms 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 ? -- View this message in context: http://old.nabble.com/puzzled-of-the-congestion-control-window-of-Scalable-TCP-tp28850421p28850421.html Sent from the netdev mailing list archive at Nabble.com. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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