From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932614AbWFJA15 (ORCPT ); Fri, 9 Jun 2006 20:27:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932613AbWFJA15 (ORCPT ); Fri, 9 Jun 2006 20:27:57 -0400 Received: from palrel10.hp.com ([156.153.255.245]:22990 "EHLO palrel10.hp.com") by vger.kernel.org with ESMTP id S932611AbWFJA14 (ORCPT ); Fri, 9 Jun 2006 20:27:56 -0400 Message-ID: <448A1208.3060602@hp.com> Date: Fri, 09 Jun 2006 17:27:52 -0700 From: Rick Jones User-Agent: Mozilla/5.0 (X11; U; HP-UX 9000/785; en-US; rv:1.6) Gecko/20040304 X-Accept-Language: en-us, en MIME-Version: 1.0 To: James Morris Cc: dlezcano@fr.ibm.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, serue@us.ibm.com, haveblue@us.ibm.com, clg@fr.ibm.com Subject: Re: [RFC] [patch 5/6] [Network namespace] ipv4 isolation References: <20060609210202.215291000@localhost.localdomain> <20060609210631.346330000@localhost.localdomain> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org James Morris wrote: > On Fri, 9 Jun 2006, dlezcano@fr.ibm.com wrote: > > >>When an outgoing packet has the loopback destination addres, the >>skbuff is filled with the network namespace. So the loopback packets >>never go outside the namespace. This approach facilitate the migration >>of loopback because identification is done by network namespace and >>not by address. The loopback has been benchmarked by tbench and the >>overhead is roughly 1.5 % > > > I think you'll need to make it so this code has zero impact when not > configured. Indeed, and over stuff other than loopback too. I'll not so humbly suggest :) netperf TCP_STREAM and TCP_RR figures _with_ CPU utilization/service demand measures. rick jones