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
Thanks!
George
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