From owner-freebsd-net@FreeBSD.ORG Mon Oct 5 12:00:59 2009 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D00001065693 for ; Mon, 5 Oct 2009 12:00:59 +0000 (UTC) (envelope-from eugen@kuzbass.ru) Received: from www.svzserv.kemerovo.su (www.svzserv.kemerovo.su [213.184.65.80]) by mx1.freebsd.org (Postfix) with ESMTP id 393DD8FC20 for ; Mon, 5 Oct 2009 12:00:58 +0000 (UTC) Received: from www.svzserv.kemerovo.su (eugen@localhost [127.0.0.1]) by www.svzserv.kemerovo.su (8.13.8/8.13.8) with ESMTP id n95C0vK3080879; Mon, 5 Oct 2009 20:00:57 +0800 (KRAST) (envelope-from eugen@www.svzserv.kemerovo.su) Received: (from eugen@localhost) by www.svzserv.kemerovo.su (8.13.8/8.13.8/Submit) id n95C0vTk080878; Mon, 5 Oct 2009 20:00:57 +0800 (KRAST) (envelope-from eugen) Date: Mon, 5 Oct 2009 20:00:57 +0800 From: Eugene Grosbein To: rihad Message-ID: <20091005120057.GA79942@svzserv.kemerovo.su> References: <20091005061025.GB55845@onelab2.iet.unipi.it> <4AC9B400.9020400@mail.ru> <20091005090102.GA70430@svzserv.kemerovo.su> <4AC9BC5A.50902@mail.ru> <20091005095600.GA73335@svzserv.kemerovo.su> <20091005100446.GA60244@onelab2.iet.unipi.it> <20091005100532.GC73335@svzserv.kemerovo.su> <4AC9C88A.5050509@mail.ru> <20091005113037.GA77999@svzserv.kemerovo.su> <4AC9DD72.9060802@mail.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4AC9DD72.9060802@mail.ru> User-Agent: Mutt/1.4.2.3i Cc: freebsd-net@freebsd.org Subject: Re: dummynet dropping too many packets X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Oct 2009 12:00:59 -0000 On Mon, Oct 05, 2009 at 04:50:10PM +0500, rihad wrote: > >>Where has TCP slow-start gone? My router box > >>isn't some application proxy that starts downloading at full 100 mbit/s > >>thus quickly filling client's 1 mbit/s link. It's just a router. > > > >While there is no or little competition for bandwidth from the router > >to clients, TCP would work just fine. I suspect your shaping policy > >makes heavy competition between clients. In this case, TCP behaves > >not-so-well without help of router's good shaping algorythms > >and taildrop is not good one. > > > > Nothing fancy (i.e. no competition). Only tons of per-user pipes > simulating the given throughput. You've mentioned previously: "The pipes are fine, each normally having 100-120 concurrent consumers (i.e. active users)." This IS competition between TCP flows inside each pipe. Eugene Grosbein