From owner-freebsd-net Tue Oct 8 10:12: 0 2002 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 9AD9337B404 for ; Tue, 8 Oct 2002 10:11:59 -0700 (PDT) Received: from tp.databus.com (p70-227.acedsl.com [66.114.70.227]) by mx1.FreeBSD.org (Postfix) with ESMTP id 10B5443E6A for ; Tue, 8 Oct 2002 10:11:59 -0700 (PDT) (envelope-from barney@tp.databus.com) Received: from tp.databus.com (localhost.databus.com [127.0.0.1]) by tp.databus.com (8.12.6/8.12.6) with ESMTP id g98HBu5S072349; Tue, 8 Oct 2002 13:11:56 -0400 (EDT) (envelope-from barney@tp.databus.com) Received: (from barney@localhost) by tp.databus.com (8.12.6/8.12.6/Submit) id g98HBtRA072348; Tue, 8 Oct 2002 13:11:55 -0400 (EDT) Date: Tue, 8 Oct 2002 13:11:55 -0400 From: Barney Wolff To: ertank@softhome.net Cc: freebsd-net@FreeBSD.ORG Subject: Re: xl driver Message-ID: <20021008171155.GA72292@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 X-Scanned-By: MIMEDefang 2.21 (www . roaringpenguin . com / mimedefang) Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org The "bad checksum" that you see in the tcpdump is not an error and has nothing to do with whatever problems you're having. The xl driver and cards have the ability to compute the checksum on the card, after tcpdump sees the packet. You'll notice that all of those messages are on packets you're sending, not receiving. Seriously asymmetric performance is often caused by duplex mismatch. Try forcing the card to half or full duplex with ifconfig, or in whatever switch you're using, and see if the problem goes away. -- Barney Wolff I'm available by contract or FT, in the NYC metro area or via the 'Net. http://www.databus.com/bwresume.pdf To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message