From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Nychis Subject: Re: want to randomly drop packets based on percent Date: Mon, 17 Apr 2006 13:05:21 -0400 Message-ID: <4443CAD1.9050701@cmu.edu> References: <444345F9.4090100@cmu.edu> <20060417091915.67e28361@localhost.localdomain> <4444171B.90507@cmu.edu> <20060417094634.7191fea5@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org Return-path: Received: from smtp.andrew.cmu.edu ([128.2.10.81]:41687 "EHLO smtp.andrew.cmu.edu") by vger.kernel.org with ESMTP id S1751164AbWDQRFZ (ORCPT ); Mon, 17 Apr 2006 13:05:25 -0400 To: Stephen Hemminger In-Reply-To: <20060417094634.7191fea5@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Stephen Hemminger wrote: >On Mon, 17 Apr 2006 18:30:51 -0400 >George Nychis wrote: > > > >>Stephen Hemminger wrote: >> >> >> >>>On Mon, 17 Apr 2006 03:38:33 -0400 >>>George Nychis wrote: >>> >>> >>> >>> >>> >>>>Hey, >>>> >>>>I'm using the 2.4.32 kernel with madwifi and iproute2 version >>>>2-2.6.16-060323.tar.gz >>>> >>>>I wanted to insert artificial packet loss based on a percent so i found: >>>>network emulab qdisc could do it, so i compiled support into the kernel >>>>and tried: >>>>tc qdisc change dev eth0 root netem loss .1% >>>> >>>> > ^^^^^^ > >You need to do add not change. Add will set the queue discipline >to netem (default is pfifo_fast). Change is for changing netem parameters >after it is loaded. > > > bahhh I see... the wiki has "change" instead of add. Now i'm running into another problem, I have an XCP qdisc that I have already added via: tc qdisc add dev ath0 root xcp capacity 54Mbit size 500 therefore when I also try to incorperate loss: tcq disc add dev ath0 root netem loss .1% I get: RTNETLINK answers: File exists Is it possible to use two qdiscs on the same interface? Thanks! George