Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 27 Oct 2001 04:41:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 27 Oct 2001 04:41:28 -0400 Received: from tux.rsn.bth.se ([194.47.143.135]:5513 "EHLO tux.rsn.bth.se") by vger.kernel.org with ESMTP id ; Sat, 27 Oct 2001 04:41:20 -0400 Date: Sat, 27 Oct 2001 10:40:59 +0200 (CEST) From: Martin Josefsson To: Anuradha Ratnaweera cc: "Jeffrey H. Ingber" , linux-kernel@vger.kernel.org Subject: Re: Other computers HIGHLY degrading network performance (DoS?) In-Reply-To: <20011027093729.B2651@bee.lk> Message-ID: X-message-flag: Get yourself a real mail client! http://www.washington.edu/pine/ MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 27 Oct 2001, Anuradha Ratnaweera wrote: > > > Just found out that this is _not_ a problem of the "download accelerator", but > > > something to do with queuing algorithm of the router. Even a normal wget > > > process or a big mail has a big impart on the network. Hopefully an iptables > > > firewall would solve the problem. > > > > I'd advice you to seriously look over your network, are you 100% sure you > > don't have a duplex-issue anywhere? > > I will double check. I wonder if this is the cause, because the network is 100 > Mbps, but the router is switching only at 64kbps. Our network almost died when someone changed the duplex in the switch here... > > I've been running linuxrouters for quite a while and right now I have a few > > linuxrouters routing 100Mbit/s internetconnections. We have never had any > > problems like the one you describe so my first guess would be that you have a > > duplexproblem, probably between the linuxrouter and the switch it's connected > > to on the inside, that's usually where it's located. > > We have a hub, and not a switch. Can this be the reason? BTW, how come that a > duplex issue can result in such huge degradations? If you are trying to run full-duplex against the hub it till completely kill the performance of the entire hub, been there, done that. When I did that one I could only push 5-50kB/s through the hub. > > I seriously doubt that this a problem with the networking in linux. > > Not in linux, may be the way they have _used_ linux on the router ;-) Hehe, I think you'll have to have quite weird QoS rules to manage to do something like this :) /Martin Never argue with an idiot. They drag you down to their level, then beat you with experience. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/