From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Schwebel Subject: Re: jitter bursts Date: Sun, 2 Sep 2007 14:05:51 +0200 Message-ID: <20070902120551.GF23573@pengutronix.de> References: <20070831151727.GT23573@pengutronix.de> <1188579323.4002.1.camel@sven.thebigcorporation.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Cc: linux-rt-users@vger.kernel.org, Michael Olbrich , kiszka@rts.uni-hannover.de To: Sven-Thorsten Dietrich Return-path: Received: from metis.extern.pengutronix.de ([83.236.181.26]:34835 "EHLO metis.extern.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965529AbXIBMF6 (ORCPT ); Sun, 2 Sep 2007 08:05:58 -0400 Content-Disposition: inline In-Reply-To: <1188579323.4002.1.camel@sven.thebigcorporation.com> Sender: linux-rt-users-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org On Fri, Aug 31, 2007 at 09:55:23AM -0700, Sven-Thorsten Dietrich wrote: > > +--------+ +-----------+ +-----------+ > > | PC EPL | | Second PC | | EPL Clamp | > > +--------+ +-----------+ +-----------+ > > | | | > > \ +----------+ / > > \----| Hub |------/ > > +----------+ > > Can you eliminate the hub as a variable? > > I have seen very similar experiments with multicast packets where the > hub delivered packets out of order, or in a delayed fashion on one port, > but not on the other. We've tried it with two different hubs (one industrial DIN rail Phoenix contact model and a standard netgeat one), without changes. Robert -- Pengutronix - Linux Solutions for Science and Industry Entwicklungszentrum Nord http://www.pengutronix.de