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From: Eric Dumazet <eric.dumazet@gmail.com>
To: Dave Taht <dave.taht@gmail.com>
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Date: Wed, 16 May 2012 09:42:27 +0200
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Cc: codel@lists.bufferbloat.net, bloat@lists.bufferbloat.net
Subject: Re: [Codel] [Bloat] Exploring the potential of codel, fq_codel,
	and qfq
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On Wed, 2012-05-16 at 00:20 -0700, Dave Taht wrote:
> After running those numbers I tried pure codel with ecn and with noecn
> just to verify results, against the 50 streams.
> 
> of note: I was unable to duplicate the initial 120ms
> spike I saw. Definately more tests and more rigorous testing is needed.
> 
> All tests were against v13 of the code.
> 
> codel ecn off, you get an initial spike of about 30ms, then it settles
> down in this range.

Spike is probably because of ARP resolution.

You should first populate ARP cache if you want to remoe ARP from the
equation (it adds another RTT for first ICMP packet)