[LARTC] Some problems with limiting downstream

["Sebastian 'spax' Pape" <pape@rbg.informatik.tu-darmstadt.de>]

hi!

I'm trying to control down- and upstream with a 2.4.3 kernel, iptables
and tc. I managed to limit the upstream and it works perfect, but
somehow my downstream traffic seems not to be affected from traffic
controlling. I'm not sure if I missunderstood something or perhaps
only mixed up some parameters - I tried several configurations, but
it's always the same: the traffic is filtered to the correct class,
but there's no limitation. The "strongest" connection can always
allocate allmost all downstream traffic.

So here's the setup - perhaps someone can give me a hint?

# DDEV="dev eth0"
# DBAND="bandwidth 768Kbit"
# DOPT="maxburst 20 avpkt 1000"

eth0 is the device to the lan, the average pakte size should be
arround 1000 (I got this from some netfilter byte counters) - but I'm
not sure about maxburst - I just took ist from the HOWTO - what's that
for?

# $TC qdisc add $DDEV root handle 1: cbq bandwidth 100Mbit avpkt 1000
mpu 64

#        $TC class add $DDEV parent 1:0 classid 1:1 cbq bandwidth
100Mbit rate 100Mbit allot 1492 weight 10Mbit prio 8 $DOPT
#        $TC class add $DDEV parent 1:1 classid 1:2 cbq bandwidth
100Mbit rate 768Kbit allot 1492 weight 77Kbit prio 6 $DOPT bounded
#        $TC class add $DDEV parent 1:2 classid 1:3 cbq $DBAND rate
688Kbit allot 1492 weight 70Kbit prio 1 $DOPT
#        $TC class add $DDEV parent 1:3 classid 1:100 cbq $DBAND rate
384Kbit allot 1492 weight 38Kbit prio 4 $DOPT
#        $TC class add $DDEV parent 1:3 classid 1:200 cbq $DBAND rate
120Kbit allot 1492 weight 12Kbit prio 2 $DOPT
#        $TC class add $DDEV parent 1:3 classid 1:300 cbq $DBAND rate
120Kbit allot 1492 weight 12Kbit prio 3 $DOPT
#        $TC class add $DDEV parent 1:3 classid 1:400 cbq $DBAND rate
64Kbit allot 1492 weight 12Kbit prio 5 $DOPT

#        $TC qdisc add $DDEV parent 1:100 prio
# the same with [1:200, 1:300 and 1:400]

Now `tc -s qdisc` shows that no pakets have been dropped, there's no
overlimit, but for example the 1:300-class got 60M while 1:200 and
1:100 only got 10M traffic per class.

My first thought was, that if I use the full bandwidth there won't be
anything to limit, because the classes are always borrowing bandwidth
to and from each other - so I changed the rate of class 1:3 to 688Kbit
to have 80Kbit "to share" but that also had no effect.

Now I've no more ideas what to change - any ideas?

thanks a lot for your time :)

		Sebastian

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