From owner-freebsd-questions Wed Aug 14 16:17:47 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D230537B400 for ; Wed, 14 Aug 2002 16:17:44 -0700 (PDT) Received: from tp.databus.com (p70-227.acedsl.com [66.114.70.227]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2ADA443E3B for ; Wed, 14 Aug 2002 16:17:44 -0700 (PDT) (envelope-from barney@databus.com) Received: from databus.com (localhost.databus.com [127.0.0.1]) by tp.databus.com (8.12.5/8.12.5) with ESMTP id g7ENHhXr034599; Wed, 14 Aug 2002 19:17:43 -0400 (EDT) (envelope-from barney@databus.com) Received: (from barney@localhost) by databus.com (8.12.5/8.12.5/Submit) id g7ENHhwd034598; Wed, 14 Aug 2002 19:17:43 -0400 (EDT) Date: Wed, 14 Aug 2002 19:17:43 -0400 From: Barney Wolff To: Matt Johnson Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Problems with the xl driver or 3Com cards? Message-ID: <20020814231743.GA34534@tp.databus.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4i Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG I can think of some possibilities: 1. Duplex mismatch - are you sure the card knows it's on a full-duplex port? If the switch is managed or has lights, what does it say about it? Try varying the media-opt setting to ifconfig. What does ifconfig xl0 say? 2. What are you using for a tcp receive window? sysctl net.inet.tcp.recvspace will tell you. Sometimes, one that's too big will cause overruns, especially if the card shares an IRQ with something else. 3. Try moving the nic to a different slot, which can change the assigned IRQ. You can detect problems of packet loss by looking at netstat -s on both sender (for retransmissions) and receiver (for duplicate packets). On Wed, Aug 14, 2002 at 06:34:27PM -0400, Matt Johnson wrote: > > I've tried everything, and I'm really lost for answers here. I have a > FreeBSD box which has a 3Com Etherlink XL in it. A while back, I got a > new 100mbps switch to replace my old 10mbps hub. I noticed that despite > now having a faster network hub, my FreeBSD machine was still unable to > get speeds of more than 200 or 300K/s. This only happened when the > FreeBSD machine was receiving. Transmitting worked fine. -- Barney Wolff I'm available by contract or FT: http://www.databus.com/bwresume.pdf To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message