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

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Message-ID: <CA+55aFyTXA3Kk5XDVNF-oa+BihB7DWy0utHnTNE4J5BGXPPOsQ@mail.gmail.com>
Date:	Wed, 15 Apr 2015 11:28:58 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.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 11:18 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.

                          Linus
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