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Date: Tue, 28 Apr 2015 12:39:03 +0200
From: Lukasz Skalski <l.skalski@samsung.com>
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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
        Tom Gundersen <teg@jklm.no>, Jiri Kosina <jkosina@suse.cz>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Daniel Mack <daniel@zonque.org>,
        David Herrmann <dh.herrmann@gmail.com>,
        Djalal Harouni <tixxdz@opendz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1
References: <20150413190350.GA9485@kroah.com> <20150423130548.GA4253@kroah.com>
 <20150423163616.GA10874@kroah.com>
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 <20150423171640.GA11227@kroah.com> <553A4A2F.5090406@samsung.com>
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On 04/27/2015 11:32 PM, Linus Torvalds wrote:
> On Fri, Apr 24, 2015 at 6:50 AM, Lukasz Skalski <l.skalski@samsung.com> wrote:
>>
>> To perform tests I've created two simple apps:
>>
>> - server: http://fpaste.org/215157/
>> - client: http://fpaste.org/215156/
> 
> So since Andy reported that dbus seems to be a few orders of magnitude
> too slow, I tried to build these apps to see what it even does.
> 
> They don't buidl on F21. You seem to be using features that are too
> new to exist even in fairly modern distros:
> 
>     server.c:47:24: error: ‘G_BUS_TYPE_USER’ undeclared
> 
> so I can't even see what dbus does *now*.
>

I've just explained it in my mail to Andy. As it was discussed some
time ago with GLib developers, we introduced two new bus
types called "user" (G_BUS_TYPE_USER) and "machine"
(G_BUS_TYPE_MACHINE). At this moment, these are only available on GLib
devel branch, so I should replace G_BUS_TYPE_USER with
G_BUS_TYPE_SESSION before I posted my benchmark apps - sorry for that.

> That said, either you're running your test on a potato, or dbus is
> seriously screwed up. No way should it take 4+ seconds to send a 1000b
> message to back and forth 20k times. But as mentioned, I can't even
> see what it's doing right now.
> 
>                       Linus
> 

-- 
Lukasz Skalski
Samsung R&D Institute Poland
Samsung Electronics
l.skalski@samsung.com
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