Re: SO_REUSEPORT and Unix domain sockets

[Tobias Oberstein]

Am 20.09.2014 03:44, schrieb Eduardo Silva:
> > 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
>
>
> Looking at the original patch looks like the implementation is only
> done for TCP and UDP:
>
>       http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c617f398edd4db2b8567a28e899a88f8f574798d

Ok, I see. Unfortunate.

> UNIX domain sockets use the file system as the address name space, so
> SO_REUSEPORT would not be applicable.

Yes, in case of Unix domain sockets, it's about "reusing paths", not ports.

Such an option for in-kernel load-balancing of Unix domain sockets would 
be useful ..

/Tobias
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