netdev - Re: [PATCH v3 net-next 2/2] netem: add cell concept to simulate special MAC behavior

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Message-ID: <20111201085701.02f885c5@nehalam.linuxnetplumber.net>
Date:	Thu, 1 Dec 2011 08:57:01 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	"David Laight" <David.Laight@...LAB.COM>
Cc:	"Hagen Paul Pfeifer" <hagen@...u.net>,
	"Eric Dumazet" <eric.dumazet@...il.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 net-next 2/2] netem: add cell concept to simulate 
 special MAC behavior

On Thu, 1 Dec 2011 16:38:51 -0000
"David Laight" <David.Laight@...LAB.COM> wrote:

>  
> > One idea to do small delays at higher speed is to insert 
> > dummy pad frames into the device.
> > It would mean generating garbage, but would allow for
> > highly accurate fine grain delay.
> 
> Not a good idea.
> They would have to be sent to a known MAC address
> otherwise all the ethernet switches would forward them
> on all output ports.
> 
> 	David
> 
> 

Yes it would have to be a constant destination, not sure if there
is a discard value in Ethernet protocol spec.
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