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

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Message-ID: <CAL4WiiqjvA7iN8nydOx9tp8gOg1M_EDWKU5N+V5JFa90JbS8Ug@mail.gmail.com>
Date:	Thu, 1 Mar 2012 09:59:05 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Rodrigo Moya <rodrigo.moya@...labora.co.uk>,
	David Laight <David.Laight@...lab.com>,
	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 1 mars 2012 08:02, Luiz Augusto von Dentz <luiz.dentz@...il.com> a écrit :
>
> Contrary to someones believes I don't think AF_INET is that fast (e.g.
> http://scottmoonen.com/2008/04/05/a-performance-comparison-of-af_unix-with-loopback-on-linux/)
>

Oh you mention a recent zork it seems ;)

Are we speaking of performance problems, apart from scheduler problems
for D-Bus (each message wakeing all receivers, all receivers read and
drop message but the target) ?

I am actually one of the few people working to improve performance on
both AF_INET and AF_UNIX parts. Just take a look at recent commits.

Right now you can send/receive millions of udp messages per second on
your linux machine, if you figured out how to avoid process scheduler
costs. If D-Bus wants more, I highly suggest using shared memory
instead of passing messages.
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