Hi Amit,
On Mon, 10 Jun 2002, Amit Kucheria wrote:
> sudo /usr/bin/tc qdisc add dev r1p4 parent 2:1 gred setup DPs 3 default 2
> grio
> ---------------------------------------------------
>
> This last line where I setup the gred qdisc shows a message in the logs as
> "NO GRED Queues setup! ". Can anybody comment on what this could mean? I
> am using 2.2.18 with a Diffserv patch.
>
> TIA,
> Amit
>
> PS.The remainin lines of the script include creating 3 gred qdiscs,
> setting their limits and creating another CBQ class (2:2) for un(ds)marked
> traffic.
Same thing here. I looked into sch_gred.c and it looks like gred complains
about the lack of DP entries in the table as soon as you issue the gred
setup command. I didn't succeed in defining the virtual queues before
I issue the gred setup command, so I decided to live with the log message.
Perhaps there is a better way to do it, but honestly I doubt it - and,
hey, Almesberger uses the same approach in his tcng example script, so at
least it can't be complete nonsense. :)
Kurt
P.S.: attached is my way of doing it - produces the log message, but
works...
#!/bin/sh
#
# author: Kurt Wagner, kwagner@cosy.sbg.ac.at
# last changed: 25.04.02
#
# Script to setup GRED
#
# Gred uses the 4 least sig. bits of skb->tc_index to map packets to
# virtual queues (DP, which stands for drop precedence). This script
# setups 4 virtual queues, packets with tc_index = 0x01 are mapped
# to DP1, 0x02 to DP2 and so on.
#
# The ECN bits (least sig. 2 bits of DS field) are masked out and
# most apps are only able to set a value for the whole DS field (if
# at all), so be carefull which DS field values you choose.
#
# e.g.:
#
# | DS field | tc_index | DP |
# +----------+----------+----+
# | 0x04 | 0x01 | 1 |
# | 0x08 | 0x02 | 2 |
# | 0x0C | 0x03 | 3 |
# | 0x10 | 0x04 | 4 |
#
DEV="eth1"
function usage
{
echo "Usage:" `basename $0` "COMMAND"
echo "where COMMAND := { start | stop | status }"
exit 1
}
if [ $# = 0 ]; then usage ; fi
case "$1" in
start)
# add the dsmarker as root and copys DS field to skb->tc_index
tc qdisc add dev $DEV handle 1:0 root dsmark indices 4 set_tc_index
# mask out ECN bits and shift right by 2 to extract DSCP
tc filter add dev $DEV parent 1:0 protocol ip prio 1 \
tcindex mask 0xfc shift 2
# general gred setup, 4 queues, nr 4 is the default queue, 'grio' says
# we use the RIO like multi-RED behavior to calculate the average queue
# lengths
tc qdisc add dev $DEV parent 1:0 handle 2:0 \
gred setup DPs 4 default 4 grio
# setup virtuall queues, priority 1 is the highest
tc qdisc change dev $DEV handle 2:0 gred limit 200KB min 15KB max 45KB \
burst 20 avpkt 1000 bandwidth 10Mbit probability 0.02 DP 1 prio 1
tc qdisc change dev $DEV handle 2:0 gred limit 200KB min 15KB max 45KB \
burst 20 avpkt 1000 bandwidth 10Mbit probability 0.02 DP 2 prio 2
tc qdisc change dev $DEV handle 2:0 gred limit 200KB min 15KB max 45KB \
burst 20 avpkt 1000 bandwidth 10Mbit probability 0.02 DP 3 prio 3
tc qdisc change dev $DEV handle 2:0 gred limit 200KB min 15KB max 45KB \
burst 20 avpkt 1000 bandwidth 10Mbit probability 0.2 DP 4 prio 4
echo -e "`basename $0` enabled \n"
;;
stop)
tc qdisc del dev $DEV root
echo -e "`basename $0` disabled \n"
;;
status)
tc -s -s -s qdisc ls dev $DEV
;;
*)
usage
;;
esac
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