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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
