From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754163AbbATQJp (ORCPT ); Tue, 20 Jan 2015 11:09:45 -0500 Received: from mail.sig21.net ([80.244.240.74]:41945 "EHLO mail.sig21.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751752AbbATQJn (ORCPT ); Tue, 20 Jan 2015 11:09:43 -0500 Date: Tue, 20 Jan 2015 17:08:42 +0100 From: Johannes Stezenbach To: Djalal Harouni Cc: Josh Boyer , David Herrmann , "Michael Kerrisk (man-pages)" , Greg Kroah-Hartman , Arnd Bergmann , "Eric W. Biederman" , One Thousand Gnomes , Tom Gundersen , Jiri Kosina , Andy Lutomirski , Linux API , linux-kernel , Daniel Mack Subject: Re: [PATCH 01/13] kdbus: add documentation Message-ID: <20150120160842.GA9474@sig21.net> References: <1421435777-25306-1-git-send-email-gregkh@linuxfoundation.org> <1421435777-25306-2-git-send-email-gregkh@linuxfoundation.org> <54BE5DC8.70706@gmail.com> <20150120145353.GA8124@dztty> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150120145353.GA8124@dztty> User-Agent: Mutt/1.5.23 (2014-03-12) X-Spam-21-Score: -2.9 (--) X-Spam-21-Report: No, score=-2.9 required=8.0 tests=ALL_TRUSTED=-1,BAYES_00=-1.9,URIBL_BLOCKED=0.001 autolearn=ham Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, On Tue, Jan 20, 2015 at 03:53:53PM +0100, Djalal Harouni wrote: > On Tue, Jan 20, 2015 at 09:42:59AM -0500, Josh Boyer wrote: > > On Tue, Jan 20, 2015 at 9:31 AM, David Herrmann wrote: > > > > > > If you run a 3.18 kernel, you can install kdbus.ko from our repository > > > and boot a full Fedora system running Gnome3 with kdbus, given that > > > you compiled systemd with --enable-kdbus (which is still > > > experimental). No legacy dbus1 daemon is running. Instead, we have a > > > bus-proxy that converts classic dbus1 to kdbus, so all > > > bus-communication runs on kdbus. > > > > FWIW, we've been building a "playground" repository for the kernel > > that contains this already for Fedora. If you have a stock Fedora 21 > > or rawhide install, you can use: > > > > https://copr.fedoraproject.org/coprs/jwboyer/kernel-playground/ > > > > which has the kernel+kdbus and systemd built with --enable-kdbus > > already. Easy enough to throw in a VM for testing. > > Another addition, if kdbus is installed and loaded, you could also use > systemd-nspawn to boot a full system (systemd compiled with > --enable-kdbus) in a container [1], kdbusfs will be mounted in the > container. > > There is also the busctl tool to query kdbus... > > http://www.freedesktop.org/wiki/Software/systemd/VirtualizedTesting/ It is reassuring that kdbus actually works :) However, let me repeat and rephrase my previous questions: Is there a noticable or measurable improvement from using kdbus? IOW, is the added complexity of kdbus worth the result? I have stated my believe that current usage of D-Bus is not performance sensitive and the number of messages exchanged is low. I would love it if you would prove me wrong. Or if you could show that any D-Bus related bug in Gnome3 is fixed by kdbus. I would sooo love it if someone would finally post some data that proves kdbus is useful beyond systemd. Thanks, Johannes