From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261811AbULGNNX (ORCPT ); Tue, 7 Dec 2004 08:13:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261808AbULGNLk (ORCPT ); Tue, 7 Dec 2004 08:11:40 -0500 Received: from quickstop.soohrt.org ([81.2.155.147]:27338 "EHLO quickstop.soohrt.org") by vger.kernel.org with ESMTP id S261805AbULGNLa (ORCPT ); Tue, 7 Dec 2004 08:11:30 -0500 Date: Tue, 7 Dec 2004 14:11:25 +0100 From: Karsten Desler To: jamal Cc: Robert Olsson , P@draigBrady.com, "David S. Miller" , netdev@oss.sgi.com, linux-kernel@vger.kernel.org Subject: Re: _High_ CPU usage while routing (mostly) small UDP packets Message-ID: <20041207131125.GB26644@soohrt.org> References: <20041206205305.GA11970@soohrt.org> <20041206134849.498bfc93.davem@davemloft.net> <20041206224107.GA8529@soohrt.org> <41B58A58.8010007@draigBrady.com> <20041207112139.GA3610@soohrt.org> <16821.42080.932184.167780@robur.slu.se> <20041207125001.GA26644@soohrt.org> <1102424673.1093.124.camel@jzny.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <1102424673.1093.124.camel@jzny.localdomain> User-Agent: Mutt/1.5.6+20040722i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * jamal wrote: > On Tue, 2004-12-07 at 07:50, Karsten Desler wrote: > > > Currently I'm having problems capturing packets with tcpdump (lots of > > "packets dropped by kernel") which indicates to me that there's > > genuinely not much (enough) idle time sitting around. > > > > Ah, more hints. So you are not trying to forward - rather just packet > capturing? forward/routing is the goal. I was just trying to capture a tcpdump to analyze the traffic to generate something that could emulate the trafficpattern for further testing in a non-production environment. Cheers, Karsten