Hi,
I'm trying to perform some (what I consider) basic traffic shaping on
our network utilising HTB. I have mostly reused the example on the
lartc.org site:
tc qdisc add dev eth0 root handle 1: htb default 10
tc class add dev eth0 parent 1: classid 1:1 htb rate 100mbit burst 24k
tc class add dev eth0 parent 1:1 classid 1:10 htb rate 50mbit ceil
80mbit burst 19k
tc class add dev eth0 parent 1:1 classid 1:20 htb rate 1mbit ceil
1mbit
tc qdisc add dev eth0 parent 1:10 handle 10: sfq perturb 10
tc qdisc add dev eth0 parent 1:20 handle 20: sfq perturb 10
tc filter add dev eth0 protocol ip parent 1:0 prio 1 u32 match ip src
X.X.X.X flowid 1:20
So we have a total of 100mbit to be used, the default class 1:10 gets
50mbit and a ceiling of 80mbit whereas my test host X.X.X.X gets only
1mbit in any situation. Some rate limiting is definitely happening, but
I am finding the outbound traffic is limited to 2mbit instead of 1mbit.
If I change the rate (to say 10mbit) the outbound traffic gets up to
again twice the rate (in this case 20mbit).
Any thoughts? I have had a look at the tc statistics but it doesn't
appear as I would expect it to. Class 1:10 shows a lot of dropped
packets but it is only averaging around 30mbit constantly. On the other
hand class 1:20 doesn't show any dropped packets. Similarly there are no
packets marked as overlimit for any class. I occasionally see the tokens
for 1:20 go negative... everything is quite strange.
Any help would be appreciated.
--
Regards,
Oliver Hookins
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