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Date:	Sun, 6 Jan 2013 02:31:17 +0100
From:	Hannes Frederic Sowa <>
To:	David Miller <>
Subject: Re: [PATCH v2] tcp: split tcp_ecn sysctl knob to distinguish between IPv4 and IPv6

On Thu, Jan 03, 2013 at 04:53:50AM -0800, David Miller wrote:
> > On Thu, Jan 03, 2013 at 01:00:09AM +0100, Hannes Frederic Sowa wrote:
> >> ECN could be more reliable when used with IPv6 (I don't have proofs). For
> >> people who want to try ECN with IPv6 but still have problems connecting
> >> to destinations because of broken IPv4 routers this switch allows one
> >> to enable ECN just for IPv6.
> >> 
> >> Perhaps ECN could be enabled by default in future.
> >> 
> >> No code changes since initial submission, just added documentation.
> > 
> > May I ask what lead to the rejection of the patch?
> I don't see any value in splitting up ipv4 and ipv6.
> I think we should turn the existing knob on unliaterally
> by default.  That would be a much better patch.

I wonder if we really should go down this route to turn on ecn by
default or if I should try to come up with a patch which marks non
working ecn paths in the destination cache and suppress ecn for those
connections. Any advice?

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