From mboxrd@z Thu Jan 1 00:00:00 1970 From: don-lartc@isis.cs3-inc.com (Don Cohen) Date: Thu, 28 Feb 2002 16:51:49 +0000 Subject: Re: [LARTC] Re: measuring queueing delay using iproute2 Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org bert hubert writes: > On Wed, Feb 27, 2002 at 08:57:11AM -0800, Don Cohen wrote: > > > > How about this: > > use tcpdump to record the packets of that class > > match up the incoming and outgoing packets > > take the difference in tcp timestamps > > Won't work - tcpdump sits before the packet scheduler, and not after. No way. For instance, the packet scheduler can decide to drop the packet. In which case it better not show up in tcpdump! Tcpdump is after dequeue, just before giving the packet to the device. _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/