netdev - Re: Add a SOCK_DESTROY operation to close sockets from userspace

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Message-Id: <1447970956.3057330.444776169.61AEFA6C@webmail.messagingengine.com>
Date:	Thu, 19 Nov 2015 23:09:16 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Tom Herbert <tom@...bertland.com>,
	David Miller <davem@...emloft.net>,
	zenczykowski <zenczykowski@...il.com>,
	Lorenzo Colitti <lorenzo@...gle.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>, Erik Kline <ek@...gle.com>,
	Dmitry Torokhov <dtor@...gle.com>
Subject: Re: Add a SOCK_DESTROY operation to close sockets from userspace



On Thu, Nov 19, 2015, at 23:04, Eric Dumazet wrote:
> On Thu, 2015-11-19 at 22:53 +0100, Hannes Frederic Sowa wrote:
> > 
> 
> > You don't steer QUIC source addresses at all? I think most networking
> > failures are of transient nature thus the kernel routing subsystem is
> > not aware of link quality and packets get lost anyway e.g. in the air?
> > Thus binding on multiple interfaces and keepalives seem still
> > appropriate, no?
> 
> Imagine you are in your home near a wifi AP, then you close a door and
> switch to 3G, or another AP.
> 
> No down time. packet will eventually reach its destination.
> 
> Application does not have to care.
> 
> Why QUIC should absolutely use '4-tuple UDP connections' when this is
> likely to fail in this scenario ?

My point is the "eventually" and the very much increased latency until
the kernel learns about new better source addresses it has available. I
would monitor link quality over time and decide source address based on
this on the sending side.
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