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

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Date:	Thu, 1 Dec 2011 16:38:51 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Stephen Hemminger" <shemminger@...tta.com>,
	"Hagen Paul Pfeifer" <hagen@...u.net>
Cc:	"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

 
> 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


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