netdev - Re: [PATCH -next 0/2] net: allow setting ecn via routing table

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Message-ID: <20141030221501.GA9416@breakpoint.cc>
Date:	Thu, 30 Oct 2014 23:15:01 +0100
From:	Florian Westphal <fw@...len.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Florian Westphal <fw@...len.de>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH -next 0/2] net: allow setting ecn via routing table

Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Thu, 2014-10-30 at 21:52 +0100, Florian Westphal wrote:
> 
> > So, what about changing the default to 1 in net-next?
> > 
> > We could add automatic 'no-ecn' to retransmitted syns to avoid
> > ecn blackholes (Daniel Borkmann has a patch for this), and, in case
> > ecn=1 causes too much breakage we can always revert (and re-consider ecn
> > per route settings as an intermediate step).
> > 
> > What do you think?
> 
> I think this is way too dangerous.
> 
> I played a lot with ECN in the past (and fixed number of bugs in linux)
> and discovered many times I had to disable it to be able to surf the
> Internet.
[..]
> Reverting might take a long long time, it wont help people stuck behind
> buggy equipment.

Do you think a fallback to non-ecn for retransmitted syns would help?
If not, do you think having ecn tunable available via route is helpful?

Thanks!
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