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Re: [SCTP-Discussion] Initial slowstart behavior of SCTP


Chronological Thread 
  • From: "Brian F. G. Bidulock" <bidulock AT openss7.org>
  • To: Torbjörn Andersson <torbjorn.andersson AT kau.se>
  • Cc: discussion AT sctp.de
  • Subject: Re: [SCTP-Discussion] Initial slowstart behavior of SCTP
  • Date: Wed Dec 4 09:42:02 2002
  • Dsn-notification-to: <bidulock AT openss7.org>
  • List-id: SCTP Discussions <discussion.sctp.de>
  • Organization: http://www.openss7.org/
Torbjörn,

RFC 2960 and in particular the IG clearly permits up to 1*MTU-1
slop (in a single message) over the current cwnd. Otherwise,
cwnd will not grow (it takes acknolwedged bytes beyond the cwnd
to grow cwnd). Any implementation is correct to send up to
1*MTU slop over the current congestion window.

--brian


On Wed, 04 Dec 2002, Torbjörn Andersson wrote:

> I have not received any answer on my previous question in my previous
> mail and I wondering why?
>
> I speculate that your implementation does this:
>
> The flowcontroll allows up to 2*MTU bytes outstanding.
> This is checked before each packet is sent and after two packets
> there is only, in my case, 200 bytes unfilled in the cwnd.
> This allows one new packet to be sent, but only with a payload
> of 200 bytes but this limit is not checked by the packetizer, which
> sends a full packet, with MTU bytes.
>
> What do you think of this? Do you have another explanation for this ?
>
> /Regards
>
> Torbjörn Andersson
> University of Karlstad, Sweden
>
> _______________________________________________
> discussion mailing list
> discussion AT sctp.de
> http://www.sctp.de/mailman/listinfo/discussion

--
Brian F. G. Bidulock ¦ The reasonable man adapts himself to the ¦
bidulock AT openss7.org
¦ world; the unreasonable one persists in ¦
http://www.openss7.org/ ¦ trying to adapt the world to himself. ¦
¦ Therefore all progress depends on the ¦
¦ unreasonable man. -- George Bernard Shaw ¦


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