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From: Eric Dumazet <eric.dumazet@gmail.com>
To: Juliusz Chroboczek <jch@pps.jussieu.fr>
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References: <4FB129EC.90200@gmail.com> <7imx5a3b4t.fsf@lanthane.pps.jussieu.fr>
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Date: Mon, 14 May 2012 20:03:41 +0200
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Cc: codel@lists.bufferbloat.net, bloat@lists.bufferbloat.net
Subject: Re: [Codel] [Bloat] better tc support for bittorrent/diffserv
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On Mon, 2012-05-14 at 19:50 +0200, Juliusz Chroboczek wrote:
> [Pro memoria, I'm the author of a few of the networking bits in
> Transmission, notably the DHT, the µTP support and large parts of the
> IPv6 code.]
> 
> > 0) No ecn on transmission, at least.
> 
> TCP flows will use ECN if your system is configured to use ECN.  µTP
> doesn't do ECN, and there's no easy way to implement it -- there's no
> API to set ECN on UDP packets.

There is an API to set ECN on UDP packets.

setsockopt() IP_TOS, with val = 2