netdev - Re: is non-inheritance of congestion control algorithm from the listen socket a bug or a feature?

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Message-ID: <1322603786.2596.36.camel@edumazet-laptop>
Date:	Tue, 29 Nov 2011 22:56:26 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	ycheng@...gle.com, rick.jones2@...com, netdev@...r.kernel.org
Subject: Re: is non-inheritance of congestion control algorithm from the
 listen socket a bug or a feature?

Le mardi 29 novembre 2011 à 16:52 -0500, David Miller a écrit :

> There is really no reason to keep the current behavior.
> 
> If an application sets the congestion control algorithm on a listening
> socket to a non-default value, what effect could possibly be intended?
> 
> Congestion control doesn't even come into play at all on a listening
> socket, therefore the only logical expectation is that it inherits to
> the child.
> 
> The only other logical behavior would be to forbid this operation on a
> listening socket, since it has no effect, but that doesn't make any
> sense now does it? :-)

Moreover, an application can use setsockopt(TCP_CONGESTION) before
calling listen() (while socket is still in CLOSE state)


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