netdev - RE: [PATCH 0/10] af_unix: add multicast and filtering features to AF

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Date:	Thu, 01 Mar 2012 04:59:35 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rodrigo Moya <rodrigo.moya@...labora.co.uk>
Cc:	David Laight <David.Laight@...LAB.COM>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	David Miller <davem@...emloft.net>, javier@...labora.co.uk,
	lennart@...ttering.net, kay.sievers@...y.org,
	alban.crequy@...labora.co.uk, bart.cerneels@...labora.co.uk,
	sjoerd.simons@...labora.co.uk, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: RE: [PATCH 0/10] af_unix: add multicast and filtering features to
 AF_UNIX

Le jeudi 01 mars 2012 à 13:50 +0100, Rodrigo Moya a écrit :
> the main problem in D-Bus we are trying to solve is the context
> switches, since right now, there is a daemon, which listens on a UNIX
> socket, and all traffic in the bus goes through it, and then the daemon
> has to route the messages it gets on that socket to the corresponding
> place(s). So, every time someone sends a message to D-Bus, since all
> traffic goes through the daemon, dbus-daemon gets waked-up, which is one
> of the biggest bottlenecks we are trying to fix.
> 
> That's why we are thinking about using multicast with socket filters, so
> that the daemon only gets traffic it cares about and thus is not waked
> up and context switches don't happen when not needed.
> 
> Using message queues, AFAICS, we would have the same problem, as the
> daemon would create the message queue and would get all traffic, right?
> 

This is why I mentioned extensions.

Anyway, if you think multicast sockets is the way to go, then you could
setup a virtual network just to be able to use AF_INET multicast.

Thats probably doable without kernel patching.



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