Messages in this thread | | | Date | Mon, 17 Apr 2006 19:08:16 -0400 | From | George Nychis <> | Subject | Re: want to randomly drop packets based on percent |
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Stephen Hemminger wrote:
>O > > >>>>>>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 >> >> >> > >Wiki reads as a set of examples. First uses, "add" after that "change". > > > > >>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? >> >> >> > >No, but netem is "classful" so you can put xcp inside netem. >Look at the token bucket example on the wiki. > > > Sorry, I was looking at the LARTC guide, completely skipped over the blatently obvious block of commands you were pointing me too :P
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