linux-kernel - Re: [GIT PULL] kdbus for 4.1-rc1

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Date:	Tue, 21 Apr 2015 14:56:32 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Andy Lutomirski <luto@...capital.net>,
	Richard Weinberger <richard@....at>,
	David Herrmann <dh.herrmann@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tom Gundersen <teg@...m.no>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

On Tue, Apr 21, 2015 at 01:03:59PM +0200, Jiri Kosina wrote:
> On Tue, 21 Apr 2015, Greg Kroah-Hartman wrote:
> 
> > > We do need something for the multicast messaging. Whether that's
> > > supporting AF_LOCAL, SOCK_RDP with multicast or something else (POSIX
> > > message queue extensions ?). There's no real IP layer reliable ordered
> > > multicast delivery system that is low latency and lightweight because
> > > once it hits real networks it changes from a hard problem into a
> > > seriously hard problem because of multicast implosions and the like.
> > 
> > This was attempted in the past with AF_DBUS, but the networking
> > maintainers rightfully pointed out that the model there did not work.
> 
> BTW, I don't think this has been brought up in this discussion yet ... 
> please correct me if I am wrong, my memory is very faint here (*), but 
> wasn't the main objection to AF_BUS that defining what happens when one of 
> the subscribed receivers disconnects is a policy matter, and as such 
> belongs to userspace (which wasn't the case with the submitted AF_BUS 
> implementation)?
> 
> Was that considered unfixable and AF_BUS consequently given up because of 
> this?

I think it was one of the reasons, I seem to remember many more.  At
that time, I had lunch with David Miller and he told me a few specific
reasons along those lines, and that it just wasn't going to work as a
network protocol at all, and to not try that method anymore, but
instead, do it as a specific IPC interface, as has been done here :)

thanks,

greg k-h
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