Re: HTB + netem - weird be haviour of a queue size

Linux Advanced Routing and Traffic Control

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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.
-- To unsubscribe from this list: send the line "unsubscribe lartc"
in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo
info at  http://vger.kernel.org/majordomo-info.html


--
To unsubscribe from this list: send the line "unsubscribe lartc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [LARTC Home Page]     [Netfilter]     [Netfilter Development]     [Network Development]     [Bugtraq]     [GCC Help]     [Yosemite News]     [Linux Kernel]     [Fedora Users]
  Powered by Linux