From owner-freebsd-stable@FreeBSD.ORG Tue Jul 12 06:57:54 2005 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EF4A416A41C; Tue, 12 Jul 2005 06:57:54 +0000 (GMT) (envelope-from danny@cs.huji.ac.il) Received: from cs1.cs.huji.ac.il (cs1.cs.huji.ac.il [132.65.16.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id 779E443D49; Tue, 12 Jul 2005 06:57:53 +0000 (GMT) (envelope-from danny@cs.huji.ac.il) Received: from pampa.cs.huji.ac.il ([132.65.80.32]) by cs1.cs.huji.ac.il with esmtp id 1DsEiG-0004x6-CJ; Tue, 12 Jul 2005 09:57:52 +0300 X-Mailer: exmh version 2.7.0 06/18/2004 with nmh-1.0.4 To: Luigi Rizzo In-Reply-To: Message from Luigi Rizzo of "Mon, 11 Jul 2005 23:42:16 PDT." <20050711234216.A11017@xorpc.icir.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 12 Jul 2005 09:57:52 +0300 From: Danny Braniss Message-ID: Cc: freebsd-net@freebsd.org, freebsd-stable@freebsd.org Subject: Re: tcp troughput weirdness 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: Tue, 12 Jul 2005 06:57:55 -0000 > we need more data points - > did you test tcp or udp ? i used iperf: Client connecting to x-dev, TCP port 5001 TCP window size: 65.0 KByte (WARNING: requested 64.0 KByte) > who is sourcing data ? all, I tried all combinations, and the numbers are very similar to the ones i posted. > are the bandwidth symmetric (i.e. A-> same as B -> A ? yes, theys are all in the same floor, fisical distance is a few meters. i also tried other similar boxes and the freebsd thoughput is very similar, so i doubt it that switches or hardware is involved. > cheers > luigi thanks, danny > > On Tue, Jul 12, 2005 at 09:21:13AM +0300, Danny Braniss wrote: > > while checking out the quality of a switch, I came about a very disturbing > > dicovery: FreeBSD <-> Linux througput is MUCH better than FreeBSD <-> FreeBSD > > > > Setup: > > 2 blades in the same bladeserver, A running FreeBSD 5.4, B running Linux > > C is running FreeBSD 5.4 > > all are connected at 1gb. > > > > A -+ (FreeBSD) > > | > > B -+ (Linux) > > | > > [switch] > > | > > +---- [router] --- C (FreeBSD) > > A & B are on the same Vlan. > > > > iperf results: > > Interval Transfer Bandwidth > > > > A <=> B 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec > > > > A <=> C 0.0-10.0 sec 515 MBytes 432 Mbits/sec > > > > B <=> C 0.0-10.0 sec 1.07 GBytes 918 Mbits/sec > > > > I've run the tests several times, and the numbers are very similar, > > so BIG Question: is there anything that can be tunned on the FreeBSD to > > better the throughput? > > > > danny > > > > > > > > _______________________________________________ > > freebsd-net@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-net > > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"