From: Simon Horman <horms@verge•net.au>
To: Mahesh Bandewar <maheshb@google•com>
Cc: David Miller <davem@davemloft•net>,
linux-netdev <netdev@vger•kernel.org>
Subject: Re: [PATCH] Net-ethtool : Allow ethtool to set interface in loopback mode.
Date: Tue, 30 Nov 2010 18:48:36 +0900 [thread overview]
Message-ID: <20101130094836.GA26315@verge.net.au> (raw)
In-Reply-To: <AANLkTikVaVv4fkLom+NSQgOUzCd2i3mbHkBNQ6PD4d9Y@mail.gmail.com>
On Tue, Nov 30, 2010 at 12:00:29AM -0800, Mahesh Bandewar wrote:
> This patch enables ethtool to set the loopback mode on a given
> interface. This is the reworked version of earlier submit (which I
> don't have reference to). 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) ifconfig eth1 192.168.1.1
Given that b) and c) use ip it seems to me that it would
make sense to use i for a) too.
ip 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
next prev parent reply other threads:[~2010-11-30 9:48 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-30 8:00 [PATCH] Net-ethtool : Allow ethtool to set interface in loopback mode Mahesh Bandewar
2010-11-30 9:48 ` Simon Horman [this message]
2010-11-30 15:01 ` Ben Hutchings
2010-11-30 19:05 ` Mahesh Bandewar
2010-11-30 19:15 ` Ben Hutchings
2010-11-30 21:22 ` Mahesh Bandewar
2010-11-30 23:57 ` [PATCH v2] " Mahesh Bandewar
2010-12-01 14:54 ` Ben Hutchings
2010-12-01 20:14 ` [PATCH v3] " Mahesh Bandewar
2010-12-01 20:17 ` Ben Hutchings
2010-12-10 4:11 ` David Miller
2011-01-05 0:30 ` [PATCH v2] net: " Mahesh Bandewar
2011-01-05 0:36 ` Stephen Hemminger
2011-01-05 1:21 ` Ben Hutchings
2011-01-05 1:29 ` Stephen Hemminger
2011-01-05 1:34 ` Rick Jones
2011-01-05 1:53 ` Stephen Hemminger
2011-01-05 1:59 ` Ben Hutchings
2011-01-05 2:06 ` Mahesh Bandewar
2011-01-05 1:39 ` Mahesh Bandewar
2011-01-05 16:22 ` Jeff Garzik
2011-01-06 22:13 ` Ben Hutchings
2011-01-07 0:47 ` Mahesh Bandewar
2011-01-07 1:30 ` Ben Hutchings
2011-01-12 19:24 ` Mahesh Bandewar
2011-01-22 0:23 ` [PATCH v4] net-next-2.6: " Mahesh Bandewar
2011-01-23 2:35 ` Ben Hutchings
2011-01-23 17:12 ` Mahesh Bandewar
2011-01-23 17:32 ` Michał Mirosław
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