From owner-freebsd-hackers  Sun May 17 03:27:55 1998
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id DAA03276
          for freebsd-hackers-outgoing; Sun, 17 May 1998 03:27:55 -0700 (PDT)
          (envelope-from owner-freebsd-hackers@FreeBSD.ORG)
Received: from zed.ludd.luth.se (zed.ludd.luth.se [130.240.16.33])
          by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id DAA03271
          for <hackers@freebsd.org>; Sun, 17 May 1998 03:27:48 -0700 (PDT)
          (envelope-from pantzer@father.ludd.luth.se)
Received: from father.ludd.luth.se (pantzer@father.ludd.luth.se [130.240.16.18])
	by zed.ludd.luth.se (8.8.5/8.8.5) with SMTP id MAA26384;
	Sun, 17 May 1998 12:27:39 +0200
Message-Id: <199805171027.MAA26384@zed.ludd.luth.se>
X-Mailer: exmh version 2.0.2 2/24/98
To: dg@root.com
cc: hackers@FreeBSD.ORG
Subject: Re: bad behaviour in slow start 
In-reply-to: Your message of "Sat, 16 May 1998 23:46:09 PDT."
             <199805170646.XAA15423@implode.root.com> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Sun, 17 May 1998 12:27:37 +0200
From: Mattias Pantzare <pantzer@ludd.luth.se>
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

> >         * Don't force slow-start on local network.
> ...
> >I think this is in violation of good TCP practices, and should be at
> ...
> >comments ?
> 
>    When sending out to a local peer, ethernet and point-to-point devices will
> buffer the initial burst of packets with the local buffers draining at the
> speed of the available link bandwidth, so I don't see why you would want to
> do slow start in this case. This is different than the case of a congested
> upstream circuit where you don't know about the congestion and have no
> control over the buffering.

The problem is that you can't detect if the other computer is a local peer or 
not, there may be routers in the path to it even if the netmask tells you that 
it is on the same subnet.  It isn't even true on the ethernet level any more, 
switches create the same problems as a router.



To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message