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

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Message-ID: <CAKbGBLj_KTp7tB+_Qf6161LwbDzzCTKF8SgcPV1Tee6sTYkzNA@mail.gmail.com>
Date:	Thu, 23 Apr 2015 22:02:52 -0700
From:	Steven Noonan <steven@...inklabs.net>
To:	Borislav Petkov <bp@...en8.de>
Cc:	David Herrmann <dh.herrmann@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Jiri Kosina <jkosina@...e.cz>,
	Andy Lutomirski <luto@...capital.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

On Thu, Apr 23, 2015 at 2:41 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Thu, Apr 23, 2015 at 11:22:39PM +0200, David Herrmann wrote:
>> No it's not. O(256) equals O(1).
>
> Ok, you're right. Maybe O() was not the right thing to use when trying
> to point out that iterating over 256 hash buckets and then following the
> chain in each bucket per packet broadcast looks like a lot.
>

Heh. I guess you could call it an "expensive O(1)". While big-O
notation is useful for describing algorithm scalability with respect
to input size, it falls flat on its face when trying to articulate
impact in measurable units.
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