From owner-freebsd-net@FreeBSD.ORG Mon Apr 12 07:33:44 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 6699A16A4CE for ; Mon, 12 Apr 2004 07:33:44 -0700 (PDT) Received: from mail-in-02.arcor-online.net (mail-in-02.arcor-online.net [151.189.21.42]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6D7C943D3F for ; Mon, 12 Apr 2004 07:33:43 -0700 (PDT) (envelope-from mailnull@mips.inka.de) Received: from kemoauc.mips.inka.de (dsl-082-082-078-046.arcor-ip.net [82.82.78.46]) by mail-in-02.arcor-online.net (Postfix) with ESMTP id 782DCB74112 for ; Mon, 12 Apr 2004 16:33:41 +0200 (CEST) Received: from kemoauc.mips.inka.de (localhost [127.0.0.1]) by kemoauc.mips.inka.de (8.12.11/8.12.10) with ESMTP id i3CEXe6i052421 for ; Mon, 12 Apr 2004 16:33:40 +0200 (CEST) (envelope-from mailnull@kemoauc.mips.inka.de) Received: (from mailnull@localhost) by kemoauc.mips.inka.de (8.12.11/8.12.11/Submit) id i3CEXeAU052420 for freebsd-net@freebsd.org; Mon, 12 Apr 2004 16:33:40 +0200 (CEST) (envelope-from mailnull) From: naddy@mips.inka.de (Christian Weisgerber) Date: Mon, 12 Apr 2004 14:33:39 +0000 (UTC) Message-ID: Originator: naddy@mips.inka.de (Christian Weisgerber) To: freebsd-net@freebsd.org Subject: re(4): puzzling netperf result 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: Mon, 12 Apr 2004 14:33:44 -0000 I just did some quick and dirty checks with netperf and noticed a somewhat surprising result. Machine A: Alpha PC164, FreeBSD 5.2-CURRENT, re(4), 1000Base-T Machine B: Alpha PC164SX, OpenBSD 3.5, de(4), 100Base-TX Switch: StarChip SGS-1008 (10/100/1000Base-T) Running netperf -t UDP_STREAM on machine A with target B reports a throughput of ~200(!) Mbit/s. How does the machine get the idea it is pushing 200 Mbit/s down a 100 Mbit/s link? -- Christian "naddy" Weisgerber naddy@mips.inka.de