From: Andy Furniss <adf.lists@gmail.com>
To: lartc@vger.kernel.org
Subject: Re: HTB + netem - weird be haviour of a queue size
Date: Fri, 12 Feb 2016 23:00:52 +0000 [thread overview]
Message-ID: <56BE6424.6070307@gmail.com> (raw)
In-Reply-To: <CAPTuX4p1ejqiV+PFEDOKNFAx4RrE4M=0-R9oJ2j-O-ASuZ6VLA@mail.gmail.com>
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@gmail.com> 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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next prev parent reply other threads:[~2016-02-12 23:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-11 10:34 HTB + netem - weird be haviour of a queue size Ewa Janczukowicz
2016-02-11 13:42 ` Ewa Janczukowicz
2016-02-12 23:00 ` Andy Furniss [this message]
2016-03-11 8:59 ` Ewa Janczukowicz
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