From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David Laight" Subject: RE: [PATCH v3 net-next 2/2] netem: add cell concept to simulate special MAC behavior Date: Thu, 1 Dec 2011 16:38:51 -0000 Message-ID: References: <20111201082436.20f21e52@nehalam.linuxnetplumber.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT Cc: "Eric Dumazet" , To: "Stephen Hemminger" , "Hagen Paul Pfeifer" Return-path: Received: from mx0.aculab.com ([213.249.233.131]:42443 "HELO mx0.aculab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755251Ab1LAQi7 convert rfc822-to-8bit (ORCPT ); Thu, 1 Dec 2011 11:38:59 -0500 Received: from mx0.aculab.com ([127.0.0.1]) by localhost (mx0.aculab.com [127.0.0.1]) (amavisd-new, port 10024) with SMTP id 28732-05 for ; Thu, 1 Dec 2011 16:38:55 +0000 (GMT) Content-class: urn:content-classes:message In-Reply-To: <20111201082436.20f21e52@nehalam.linuxnetplumber.net> Sender: netdev-owner@vger.kernel.org List-ID: > 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