Hello,
I run one of my PCs as my personal router, with iptables+tc to control
traffic and be my firewall.
In TC, I use a combination of htb, qdisc and sfq (as well as prio) to
classify bandwidth. In my current setup, I have 10 classifications of my
bandwidth. (Even I admit this is probably more than I need, but at this
point I'm still learning, so I'll just leave them be.) This leads me to
my question about how TC enforces maximum bandwidth limits.
I am on DSL internet with rates 1.5Mbps/384kbps. I do not make complete
use of my pipe just in case of a massive burst. I know I will probably
not burst such a massive burst, but its better to be safe than sorry.
To help understand this, here are the classes and their associated
bandwidths as I have them set in TC:
(MAX_RATE is 360kbps)
$TC qdisc add dev $IFext root handle 1: htb default 90
$TC class add dev $IFext parent 1: classid 1:1 htb rate $MAX_RATE
quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:10 htb rate 240kbps
ceil $MAX_RATE prio 0 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:20 htb rate 192kbps
ceil $MAX_RATE prio 1 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:30 htb rate 80kbps
ceil $MAX_RATE prio 2 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:40 htb rate 64kbps
ceil $MAX_RATE prio 3 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:50 htb rate 32kbps
ceil $MAX_RATE prio 4 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:60 htb rate 20kbps
ceil $MAX_RATE prio 5 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:70 htb rate 16kbps
ceil $MAX_RATE prio 6 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:80 htb rate 8kbps ceil
$MAX_RATE prio 7 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:90 htb rate 2kbps ceil
$MAX_RATE prio 8 quantum $QUANTUM
$TC class add dev $IFext parent 1:1 classid 1:100 htb rate 2kbps
ceil 20kbps prio 9 quantum $QUANTUM
$TC qdisc add dev $IFext parent 1:10 handle 10: sfq perturb 10
$TC qdisc add dev $IFext parent 1:20 handle 20: sfq perturb 10
$TC qdisc add dev $IFext parent 1:30 handle 30: sfq perturb 10
$TC qdisc add dev $IFext parent 1:40 handle 40: sfq perturb 10
$TC qdisc add dev $IFext parent 1:50 handle 50: sfq perturb 10
$TC qdisc add dev $IFext parent 1:60 handle 60: sfq perturb 10
$TC qdisc add dev $IFext parent 1:70 handle 70: sfq perturb 10
$TC qdisc add dev $IFext parent 1:80 handle 80: sfq perturb 10
$TC qdisc add dev $IFext parent 1:90 handle 90: sfq perturb 10
$TC qdisc add dev $IFext parent 1:100 handle 100: sfq perturb 10
Class 90 is the default. Class 100 is a special class, and what my
question specifically relates to. Class 100 is for bit torrent. I do not
like the other people in my house using very much bandwidth for
torrenting as it has a tendency to slow things down to greatly. The
problem I have is this: when I disable a given torrent clients upload
limits, the bandwidth climbs to above the 20kbps limit I have set for
it. When I classify the traffic in iptables, i put it into class 100, so
it shouldn't getting put into the default class.
While I understand how/why TC enforces minimum bandwidth for a given
class, why is it that for class 100 TC is not enforcing the cap of
20kbps to traffic that it is classified at? Is there something else I
need to do to make TC also enforce arbitrary maximum limits for a given
classification?
Vadtec
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