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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Sat, 23 Nov 2013 12:23:20 +0200
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To: Dong Mo <montedong@gmail.com>
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Subject: Re: [Codel] New to codel-- how to run codel on a linux box?
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On 23 Nov, 2013, at 7:04 am, Dong Mo wrote:

> I am new to codel and I would like to run some experiments with codel =
on a linux box acting as a router. I see on the wiki that running codel =
on linux requires BQL support from NIC driver. I would like to know is =
this an essential requirement to run codel on linux box or it is =
optional?

It's not a hard requirement - but large hardware queues (which BQL tries =
to solve) tend to interfere with line-rate operation.

> I don't require line rate performance, something like 100Mbps =
throughput will be enough for the experiment. However, It is also not =
clear to me that how Codel is going to interact with some software =
traffic shaping say bandwidth limiting?

tc qdisc add dev $IFACE root handle 1: htb default 1
tc class add dev $IFACE parent 1: classid 1:1 htb rate $RATE burst 15k
tc qdisc add dev $IFACE parent 1:1 handle 10: fq_codel

That works perfectly well if $RATE is less than line rate, even without =
BQL.

 - Jonathan Morton