Hello,
I'm a total tc newbie, and I'm trying to tweak the wondershaper script
(http://lartc.org/wondershaper/) to get a slightly different result.
Excuse me if I will not use the correct technical terms, it's a whole
new world to me :)
wondershaper.htb creates 3 HTB classes; 1:10 is high prio, 1:20 is bulk
(default), and 1:30 is low priority. The classes are created as follows:
==========================================================
tc class add dev $DEV parent 1:1 classid 1:10 htb \
rate ${UPLINK}kbit \
burst 6k prio 1
tc class add dev $DEV parent 1:1 classid 1:20 htb \
rate $[9*$UPLINK/10]kbit ceil ${UPLINK}kbit \
burst 6k prio 2
tc class add dev $DEV parent 1:1 classid 1:30 htb \
rate $[1*$UPLINK/10]kbit ceil ${UPLINK}kbit \
burst 6k prio 2
==========================================================
What I would like to do is to always give priority to traffic in class
1:20 respect to class 1:30: basically, if there is a lot of traffic in
class 1:20, class 1:30 shouldn't have any bandwidth allocated beside its
minimum rate.
I'll try to clarify the above paragraph with an example; let's assume
that if I download file A from this server, the generated traffic goes
to class 1:20; if I download file B, the traffic goes to class 1:30.
Let's also say that UPLINK is 1Mbit/s.
0) Server does nothing.
1) I start downloading B. I begin downloading it a 1Mbit/s.
2) I then start download A while B is going. A's download totally
steals traffic from B's download, up to its minimum rate. So, after a
little while, I should see download B going to 10% = 100Kbit and
download A going to 90% = 900Kbit.
3) I stop download B. A goes up to 1Mbit.
4) I apply a client-side limit to A's download. Now A goes to 600Kbit.
5) I start downloading B again. B cannot steal any bandwidth to A, but
it will get all the available bandwidth. So A will stay at 600Kbit, and
B will go at 400Kbit.
I hope my explanation is clear.
Wondershaper does not seem to do this. In fact, when I start downloading
A and B, they seem to equally distribute the available bandwidth (I
verified that packets really go to the respective classes, so it's not a
filter problem). It's not clear to me how HTB decides to allocate the
bandwidth, and what the "rate" parameter really means.
I even tried the CBQ version of wondershaper, but I got the same results.
Do you have any suggestion about how can I achieve my expected
behaviour? How should I modify wondershaper?
Thanks!
--
Giovanni Bajo
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