From owner-freebsd-net@FreeBSD.ORG Fri Sep 17 21:26:23 2004 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D878D16A4CE for ; Fri, 17 Sep 2004 21:26:23 +0000 (GMT) Received: from c00l3r.networx.ch (c00l3r.networx.ch [62.48.2.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id E85F143D45 for ; Fri, 17 Sep 2004 21:26:22 +0000 (GMT) (envelope-from andre@freebsd.org) Received: (qmail 19918 invoked from network); 17 Sep 2004 21:21:13 -0000 Received: from dotat.atdotat.at (HELO [62.48.0.47]) ([62.48.0.47]) (envelope-sender ) by c00l3r.networx.ch (qmail-ldap-1.03) with SMTP for ; 17 Sep 2004 21:21:13 -0000 Message-ID: <414B567C.9060904@freebsd.org> Date: Fri, 17 Sep 2004 23:26:20 +0200 From: Andre Oppermann User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8a1) Gecko/20040520 X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Raphael H. Becker" References: <20040917104356.E55054@p-i-n.com> <414ADD15.FAC42CDB@freebsd.org> <20040917231922.G55054@p-i-n.com> In-Reply-To: <20040917231922.G55054@p-i-n.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-net@freebsd.org cc: freebsd-current@freebsd.org Subject: Re: Strange things on GBit / 1000->100 / net.inet.tcp.inflight.* X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 17 Sep 2004 21:26:24 -0000 Raphael H. Becker wrote: > On Fri, Sep 17, 2004 at 02:48:21PM +0200, Andre Oppermann wrote: > >>"Raphael H. Becker" wrote: >> >>>My guess: The 5.3-Boxes send bigger TCP-Windows than our switch has >>>buffer for each port resulting in massive packetloss or something like >>>that. The sender is "too fast" for the switch or the switch isn't able >>>to convert from 1000MBit to 100MBit under heavy load >>>(store&forward-buffer) >> >>Could you send me the output of (after you have run the 1000->100 test): >> >> # sysctl net.inet.tcp >> # sysctl net.inet.tcp.hostcache.list >> # netstat -s -p tcp >> # netstat -s -p ip > > http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_before.txt > http://rhb.uugrn.org/FreeBSD/bugs/5.x/1000-to-100/check_after.txt Could you please provide the same information (except the second sysctl one) from the target machine as well. You don't have to show the difference between before and after but try to make sure that not much other traffic was going than the test. -- Andre