From owner-freebsd-current Thu Feb 24 10:48:46 2000 Delivered-To: freebsd-current@freebsd.org Received: from gatesrv.rz.unibw-muenchen.de (gatesrv.RZ.UniBw-Muenchen.de [137.193.10.21]) by hub.freebsd.org (Postfix) with ESMTP id DA03837BCEF for ; Thu, 24 Feb 2000 10:48:38 -0800 (PST) (envelope-from didi@Xterminator.STUDFB.UniBw-Muenchen.de) Received: from xterminator.studfb.unibw-muenchen.de (Xterminator.STUDFB.UniBw-Muenchen.de [137.193.211.64]) by gatesrv.rz.unibw-muenchen.de (8.9.1b+Sun/8.9.3) with ESMTP id TAA24144; Thu, 24 Feb 2000 19:48:36 +0100 (MET) Received: from didi (wintermute.STUDFB.UniBw-Muenchen.de [137.193.211.253]) by xterminator.studfb.unibw-muenchen.de (8.9.3/8.8.6) with SMTP id TAA09736; Thu, 24 Feb 2000 19:48:32 +0100 From: Dieter Rothacker To: Chris Wasser Cc: freebsd-current@FreeBSD.ORG Subject: Re: dc0 wierdness with Compex Freedomline Date: Thu, 24 Feb 2000 19:48:35 +0100 Organization: Organized ? No way... Message-ID: References: <20000224120438.A24299@shadowmere.student.utwente.nl> <20000224102131.A1796@area51.v-wave.com> In-Reply-To: <20000224102131.A1796@area51.v-wave.com> X-Mailer: Forte Agent 1.6/32.661 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, 24 Feb 2000 10:21:31 -0700, Chris Wasser wrote: >> Downloading an 128 MB-file from the network to /dev/null results in speeds >> like 9.8 MB/s (close to the theoretical maximum for a 100 Mbps network) > >The theoretical maximum for 100BaseT-FDX (which is 200Mbps) is 25MB/s >(megabytes per second), 100BaseT-TX is 12MB/s [FYI: Mbps->MB/s you divide >by 8] I realize my punctuation may be off, but there you are. No, it is not. It is 100Mbps upstream and 100Mbps downstream. You cannot get 200Mbps in one direction. FDX (Full Duplex) simply means that the RX and TX cables are used simultaneous. Due to the small ethernet frame size, it is next to impossible to get the full speed for data transmission. -- Dieter Rothacker To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message