From owner-freebsd-stable@FreeBSD.ORG Thu Feb 18 17:18:41 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EFE821065676 for ; Thu, 18 Feb 2010 17:18:41 +0000 (UTC) (envelope-from jdc@koitsu.dyndns.org) Received: from qmta09.emeryville.ca.mail.comcast.net (qmta09.emeryville.ca.mail.comcast.net [76.96.30.96]) by mx1.freebsd.org (Postfix) with ESMTP id D42468FC17 for ; Thu, 18 Feb 2010 17:18:41 +0000 (UTC) Received: from omta11.emeryville.ca.mail.comcast.net ([76.96.30.36]) by qmta09.emeryville.ca.mail.comcast.net with comcast id jSbC1d0080mlR8UA9VJi1P; Thu, 18 Feb 2010 17:18:42 +0000 Received: from koitsu.dyndns.org ([98.248.46.159]) by omta11.emeryville.ca.mail.comcast.net with comcast id jVJh1d0093S48mS8XVJh4D; Thu, 18 Feb 2010 17:18:42 +0000 Received: by icarus.home.lan (Postfix, from userid 1000) id 72CCE1E301A; Thu, 18 Feb 2010 09:18:40 -0800 (PST) Date: Thu, 18 Feb 2010 09:18:40 -0800 From: Jeremy Chadwick To: freebsd-stable@freebsd.org Message-ID: <20100218171840.GA60610@icarus.home.lan> References: <4B7C1365.9070806@omnilan.de> <70CD649D-7659-4CE2-A16C-49B8C891CB5B@mac.com> <4B7C4066.5040006@omnilan.de> <4B7D3938.1000309@omnilan.de> <4B7D5AC4.9020509@mahan.org> <4B7D61DE.2020906@omnilan.de> <4B7D6635.20605@sasktel.net> <4B7D6857.80902@sasktel.net> <4B7D7055.3060601@omnilan.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4B7D7055.3060601@omnilan.de> User-Agent: Mutt/1.5.20 (2009-06-14) Subject: Re: RELENG_8 ignoring TCP window size? [Was: Re: Help for TCP understanding wanted, ACK-MSS-Window [Was: Re: best practice to watch TCP parms of established sockets]] X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Feb 2010 17:18:42 -0000 On Thu, Feb 18, 2010 at 05:52:37PM +0100, Harald Schmalzbauer wrote: > Stephen Hurd schrieb am 18.02.2010 17:18 (localtime): > ... > >one retransmit per five packets). Is this what you're seeing? If > >you have a capture you could share covering a few seconds, I could > >take a look and provide a better opinion. > > Thanks for your help, here's a small snippet of the iperf session. > There are hundreds od duplicate ACKs. I'm not sure how to understand > that. Like mentioned, I have to refresh some TCP basics before I can > do usefull tests. > But perhaps you can confirm that this behaviour is intendend, or > where the problem could be... Could you please re-run this capture (you're presumably using tcpdump) with the "-s 0" flag set? Also, can you state which machine/OS type is associated with what IP address? -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |