linux-kernel - SO_REUSEPORT and Unix domain sockets

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Message-ID: <538460FE.8030000@gmail.com>
Date:	Tue, 27 May 2014 11:55:10 +0200
From:	Tobias Oberstein <tobias.oberstein@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: SO_REUSEPORT and Unix domain sockets

Linux kernels >= 3.9 allow sharing of sockets between processes with 
in-kernel load-balancing by setting SO_REUSEPORT (eg 
http://lwn.net/Articles/542629/)

How can this be used for sockets of type AF_UNIX?

I can only get it working with TCP sockets, not Unix domain sockets.

When using TCP, the incoming clients will get nicely balanced to all 
processes listening. With Unix domain sockets, the incoming clients all 
get connected only to the last started process.

The test code (Python) I was trying is here:

http://stackoverflow.com/questions/23742368/can-so-reuseport-be-used-on-unix-domain-sockets

Any hints appreciated,
/Tobias
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