All of lore.kernel.org
 help / color / mirror / Atom feed
From: Martin Devera <devik@cdi.cz>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Re: further CBQ/tc documentation ds9a.nl/lartc/manpages
Date: Mon, 10 Dec 2001 13:40:09 +0000	[thread overview]
Message-ID: <marc-lartc-100799169232416@msgid-missing> (raw)
In-Reply-To: <marc-lartc-100785524509147@msgid-missing>

> > Are you sure !? TCP slows down by half on every dropped
> > packet per congestion window AFAIK.
> > On other side it is often hard to slow TCP down by packet
> > delay as TCP will try to accomodate it by making MSS larger.
> > Am I right jamal ?
> 
> You basically need both, or your packet drops will constantly be fighting 
> retransmits as TCP is trying to recover. There will eventually be a balance, 
> but not a too nice one.

I'd paste part of old jamal's email here:
----
Recall Mathis equation: TCP b/width = C*MSS/(RTT*sqrt(p))
where p is the drop probability and C is a constant which changes under
different conditions
----
Additionaly TCP tries to adapt window to RTT so that min(MSS,cwnd)/RTT
changes very slowly. Thus remaining part is C/sqrt(P). As you
see - it is hard to slow TCP down without dropping... 

If you will set up infinite queue and delay by 1s the TCP
will keep window increasing until drop occurs or reciever's
advertised window is hit.

I'd suggest you to read rfs2001.
devik



_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/lartc/

  parent reply	other threads:[~2001-12-10 13:40 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-12-08 20:43 [LARTC] Re: further CBQ/tc documentation ds9a.nl/lartc/manpages jamal
2001-12-08 21:30 ` bert hubert
2001-12-08 21:56 ` jamal
2001-12-08 23:08 ` bert hubert
2001-12-08 23:29 ` jamal
2001-12-08 23:30 ` jamal
2001-12-08 23:45 ` Henrik Nordstrom
2001-12-08 23:54 ` bert hubert
2001-12-09  1:19 ` jamal
2001-12-09  1:35 ` bert hubert
2001-12-09  2:11 ` jamal
2001-12-09  2:30 ` jamal
2001-12-09 11:38 ` Henrik Nordstrom
2001-12-09 14:40 ` bert hubert
2001-12-09 14:49 ` jamal
2001-12-09 15:01 ` jamal
2001-12-09 15:49 ` Henrik Nordstrom
2001-12-09 16:45 ` Henrik Nordstrom
2001-12-09 21:41 ` jamal
2001-12-09 22:33 ` Michael T. Babcock
2001-12-09 22:36 ` Michael T. Babcock
2001-12-10  1:12 ` Cédric Rivard
2001-12-10  7:53 ` Don Cohen
2001-12-10  8:38 ` Martin Devera
2001-12-10  8:41 ` Henrik Nordstrom
2001-12-10  9:59 ` Henrik Nordstrom
2001-12-10 11:35 ` Martin Devera
2001-12-10 11:59 ` Martin Devera
2001-12-10 12:00 ` Henrik Nordstrom
2001-12-10 12:14 ` bert hubert
2001-12-10 12:25 ` Henrik Nordstrom
2001-12-10 12:52 ` Martin Devera
2001-12-10 13:29 ` jamal
2001-12-10 13:40 ` Martin Devera [this message]
2001-12-10 13:42 ` Jim Fleming
2001-12-10 13:52 ` Michael T. Babcock
2001-12-10 13:54 ` Michael T. Babcock
2001-12-10 13:56 ` Gerry Creager N5JXS
2001-12-10 13:58 ` Michael T. Babcock
2001-12-10 14:02 ` Martin Devera
2001-12-10 14:51 ` Jim Fleming

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=marc-lartc-100799169232416@msgid-missing \
    --to=devik@cdi.cz \
    --cc=lartc@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.