netdev - Re: [PATCH net-next] tcp: extend ECN sysctl to allow server-side only ECN

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Date:	Mon, 04 May 2009 11:07:53 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: extend ECN sysctl to allow server-side
 only ECN

From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Mon, 4 May 2009 18:12:26 +0300 (EEST)

> This should be very safe compared with full enabled, so I see
> no reason why it shouldn't be done right away. As ECN can only
> be negotiated if the SYN sending party is also supporting it,
> somebody in the loop probably knows what he/she is doing. If
> SYN does not ask for ECN, the server side SYN-ACK is identical
> to what it is without ECN. Thus it's quite safe.
> 
> The chosen value is safe w.r.t to existing configs which
> choose to currently set manually either 0 or 1 but
> silently upgrades those who have not explicitly requested
> ECN off.
> 
> Whether to just enable both sides comes up time to time but
> unless that gets done now we can at least make the servers
> aware of ECN already. As there are some known problems to occur
> if ECN is enabled, it's currently questionable whether there's
> any real gain from enabling clients as servers mostly won't
> support it anyway (so we'd hit just the negative sides). After
> enabling the servers and getting that deployed, the client end
> enable really has some potential gain too.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>

Seems reasonable, applied, thanks!
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