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It's because you limit the receiver window. As we know, the CWND can grow
only when the current congestion window is being fully utilized. However, at
any given time, the data sender MUST NOT transmit new data to any
destination transport address if its peer's receiver window indicates that
the peer has no buffer space (i.e. receiver window is 0, see RFC 2960).
Therefore, when CNWD reaches the value of the receiver window, it won't be
able to grow any more.



----- Original Message -----
From: "sridharareddy duggireddy"
<dsridhar18 AT yahoo.com>
To:
<discussion AT sctp.de>
Sent: Thursday, April 01, 2004 9:05 AM
Subject: [SCTP-Discussion] problem with increasing CWND variable


> Hi,
>
> I have written a tcl script to measure the
> throughput of SCTP protocol. In that script I have
> specified the initial receiver window size as 131026
> and initial ssthresh value as defaut value(65536). I
> am using only one stream. When I ran the script and
> looked at the trace file, the cwnd variable is
> increasing until it reaches the value of initial
> receiver window(131026) and then it is staying
> constant for the remaining time. So the throughput is
> not increasing even if I am increasing the link
> capacity? May I know the reason for this?
>
> Thanks,
> Sridhar!!
>
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• [SCTP-Discussion] problem with increasing CWND variable, sridharareddy duggireddy, 04/01/2004
  • Re: [SCTP-Discussion] problem with increasing CWND variable, Liran Ma@OU, 04/01/2004
  • <Possible follow-up(s)>
  • Re: [SCTP-Discussion] problem with increasing CWND variable, Liran Ma@OU, 04/01/2004

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