From: jellyaaa <wgdaaa@126•com>
To: netdev@vger•kernel.org
Subject: puzzled of the congestion control window of Scalable TCP
Date: Thu, 10 Jun 2010 18:15:35 -0700 (PDT) [thread overview]
Message-ID: <28850421.post@talk.nabble.com> (raw)
I am now doing something related to the STCP (Scalable TCP). By pringking the
dynamic snd_cwnd in linux (kernel 2.6.18) ,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
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.
reply other threads:[~2010-06-11 1:15 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=28850421.post@talk.nabble.com \
--to=wgdaaa@126$(echo .)com \
--cc=netdev@vger$(echo .)kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox