Ewa Janczukowicz wrote:
Ok, I have just realized by doing ifconfig that the queue length of
my bridge (br0) was 0. So I suppose this was causing the problem.
However I still do not know whant happens it I use htb and netem in
the above configuration and e.g. I change the queue length of htb to
1000. Will it be applicable to both netem and htb queueus? Or will I
have one two queues of 1000, on after another.
Thank you in advance.
Not sure about that specifically.
Maybe you don't even need htb as netem now has a rate option which will
be useful to emulate bitrate latency and wasn't there when I tried this
around a decade ago.
I am not sure whether or not netem will work with stab (which lets you
accurately add ATM/PPP overheads).
With htb you can specify child qdiscs anyway to control length, I don't
know about netem - if you can't find a way you could try changing txqlen
on br0/eth0 with ip link set ...
If bridging doesn't work out for some reason you can double queue using ifb.
On Thu, Feb 11, 2016 at 11:34 AM, Ewa Janczukowicz
<janczukowicz.ewa@xxxxxxxxx> wrote:
Hello,
I want to emulate ADSL link behaviour. For that I decided to use
netem and configure its rate and delay parameters.
Additionally I test different queuing configurations e.g. htb.
Since if I use htb, I can only configure netem on leaves, I decided
to create a virtual bridge. As a results I have the following
configuration: - I have virtual bridge (br0) and I attached the
phycical inerface to it. - On virtual bridge I configure htb - On
physical interface I configure netem.
However using htb and netem changes the queue size.
If I only use htb, the queue size is 1000. The same happens if I
only use netem. However when I use both of them, the queue size
becomes much shorter.
Is there any way I can check what queue size is configured? I know
I can overwrite this configuration, however finally I am not sure
how netem and htb interact and what queue I configure.
Thank you in advance for any help.
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