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

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Date:	Wed, 15 Apr 2015 20:37:12 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Jiri Kosina <jkosina@...e.cz>,
	Al Viro <viro@...iv.linux.org.uk>,
	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>,
	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>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

On Wed, Apr 15, 2015 at 11:28:58AM -0700, Linus Torvalds wrote:
> On Wed, Apr 15, 2015 at 11:18 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > I've seen this claimed, but I have never seen any actual numbers. What
> > speeds up? By how much? is it actually measurable?
> 
> And just to clarify: by "what speeds up, and by how much", I do _not_
> mean "sending a dbus message speeds up by 10x and avoids context
> switches". I've seen _those_ numbers. But does it actually matter?
> 
> It was more of a "there are thousands of dbus messages during boot,
> but can you actually measure the speedup?" question. That's the kind
> of numbers I've not seen.

Someone from BMW did the testing on one of their car systems a while ago
and posted some numbers, it was a factor of 10 faster.  I'll try to dig
it up, but it was burried in a powerpoint presentation, so it might be
hard to find, give me a day.

thanks,

greg k-h
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