netdev - Re: [PATCH 1/1] add ethtool loopback support

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Message-Id: <1270832141.2108.6.camel@achroite.uk.solarflarecom.com>
Date:	Fri, 09 Apr 2010 17:55:41 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Laurent Chavey <chavey@...gle.com>
Cc:	Jeff Garzik <jeff@...zik.org>, davem@...emloft.net,
	netdev@...r.kernel.org, therbert@...gle.com
Subject: Re: [PATCH 1/1] add ethtool loopback support

Don't top-post.

On Fri, 2010-04-09 at 09:43 -0700, Laurent Chavey wrote:
> isn't the existing ETHTOOL_TEST ioctl use for something like self test ?
> 
> the intent of this patch is to enable a mode whereby one could run
> netperf / iperf and other application  and have the packets sent and
> received by the driver.
[...]

If you send to a local address, the traffic will be routed over the
internal loopback interface.  Applications will not use a network
interface in loopback unless they override routing or send raw packets.
netperf and iperf don't allow you todo that, so far as I'm ware.

Also those applications are *performance* tests; they are not very
useful for fault-finding.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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