From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH v3] Net-ethtool : Allow ethtool to set interface in loopback mode. Date: Thu, 09 Dec 2010 20:11:42 -0800 (PST) Message-ID: <20101209.201142.71115585.davem@davemloft.net> References: <1291215255.3170.12.camel@bwh-desktop> <1291234623.3170.17.camel@bwh-desktop> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: maheshb@google.com, netdev@vger.kernel.org, chavey@google.com To: bhutchings@solarflare.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:45790 "EHLO sunset.davemloft.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754838Ab0LJELO (ORCPT ); Thu, 9 Dec 2010 23:11:14 -0500 In-Reply-To: <1291234623.3170.17.camel@bwh-desktop> Sender: netdev-owner@vger.kernel.org List-ID: From: Ben Hutchings Date: Wed, 01 Dec 2010 20:17:03 +0000 > On Wed, 2010-12-01 at 12:14 -0800, Mahesh Bandewar wrote: >> This patch enables ethtool to set the loopback mode on a given >> interface. By configuring the interface in loopback mode in conjunction >> with a policy route / rule, a userland application can stress the egress / >> ingress path exposing the flows of the change in progress and potentially >> help developer(s) understand the impact of those changes without even >> sending a packet out on the network. >> >> Following set of commands illustrates one such example - >> a) ip -4 addr add 192.168.1.1/24 dev eth1 >> b) ip -4 rule add from all iif eth1 lookup 250 >> c) ip -4 route add local 0/0 dev lo proto kernel scope host table 250 >> d) arp -Ds 192.168.1.100 eth1 >> e) arp -Ds 192.168.1.200 eth1 >> f) sysctl -w net.ipv4.ip_nonlocal_bind=1 >> g) sysctl -w net.ipv4.conf.all.accept_local=1 >> # Assuming that the machine has 8 cores >> h) taskset 000f netserver -L 192.168.1.200 >> i) taskset 00f0 netperf -t TCP_CRR -L 192.168.1.100 -H 192.168.1.200 -l 30 >> >> Signed-off-by: Mahesh Bandewar > [...] > Reviewed-by: Ben Hutchings This patch doesn't apply, it has been corrupted by Mahesh's email client. Mahesh, please correct this problem and resubmit.