From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267671AbUGaOxj (ORCPT ); Sat, 31 Jul 2004 10:53:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267641AbUGaOxj (ORCPT ); Sat, 31 Jul 2004 10:53:39 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:42895 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S267671AbUGaOxh (ORCPT ); Sat, 31 Jul 2004 10:53:37 -0400 Date: Sat, 31 Jul 2004 11:51:13 -0300 From: Marcelo Tosatti To: Tim Hockin Cc: Colin Paton , linux-kernel@vger.kernel.org Subject: Re: Natsemi ethernet 'cable magic' fix can cause problems Message-ID: <20040731145113.GF6497@logos.cnet> References: <1084444503.4548.141.camel@colinp> <20040513170358.GA19426@hockin.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040513170358.GA19426@hockin.org> User-Agent: Mutt/1.5.5.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 13, 2004 at 10:03:58AM -0700, Tim Hockin wrote: > On Thu, May 13, 2004 at 11:35:03AM +0100, Colin Paton wrote: > > The problem was strange - about 30% packet loss was experienced during > > pings. Moving the box to a different ethernet wall outlet (but still > > using the same port on the switch) cured the problem. The problem > > therefore appeared to be cable dependant. > > > > It would appear that the call to 'do_cable_magic()' in > > drivers/net/natsemi.c causes the problem to occur. > > > > It looks as though this was added in to actually *fix* such problems... > > but in our case it made things worse. > > I'm the responsible party on that one. do_cable_magic() was a direct > result of a significant amount of work with National's engineers to > root-cause some major problems we had had. > > If I recall, the problem we experienced was when the cable was "short" > (where short was < 30m, I think). What can you tell me about your cabling > setup? > > Willing to test? Ping me back. Hi Tim, Collin, Did you made any progress on this issue?