From owner-freebsd-hackers@FreeBSD.ORG  Tue Jan 22 14:32:53 2008
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 02CF316A41B;
	Tue, 22 Jan 2008 14:32:53 +0000 (UTC) (envelope-from des@des.no)
Received: from tim.des.no (tim.des.no [194.63.250.121])
	by mx1.freebsd.org (Postfix) with ESMTP id B578613C45A;
	Tue, 22 Jan 2008 14:32:52 +0000 (UTC) (envelope-from des@des.no)
Received: from tim.des.no (localhost [127.0.0.1])
	by spam.des.no (Postfix) with ESMTP id B6AAB2085;
	Tue, 22 Jan 2008 15:32:44 +0100 (CET)
X-Spam-Tests: AWL
X-Spam-Learn: disabled
X-Spam-Score: -0.2/3.0
X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on tim.des.no
Received: from ds4.des.no (des.no [80.203.243.180])
	by smtp.des.no (Postfix) with ESMTP id A70242083;
	Tue, 22 Jan 2008 15:32:44 +0100 (CET)
Received: by ds4.des.no (Postfix, from userid 1001)
	id 8E4AA844B6; Tue, 22 Jan 2008 15:32:44 +0100 (CET)
From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Daniel Eischen <deischen@freebsd.org>
References: <4795CC13.7080601@moneybookers.com> <868x2i3v8d.fsf@ds4.des.no>
	<864pd63v2h.fsf@ds4.des.no>
	<Pine.GSO.4.64.0801220831360.4862@sea.ntplx.net>
Date: Tue, 22 Jan 2008 15:32:44 +0100
In-Reply-To: <Pine.GSO.4.64.0801220831360.4862@sea.ntplx.net> (Daniel
	Eischen's message of "Tue\, 22 Jan 2008 08\:34\:15 -0500 \(EST\)")
Message-ID: <86prvu0w37.fsf@ds4.des.no>
User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.1 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Cc: freebsd-hackers@freebsd.org,
	Stefan Lambrev <stefan.lambrev@moneybookers.com>
Subject: Re: gettimeofday() in hping
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 22 Jan 2008 14:32:53 -0000

Daniel Eischen <deischen@freebsd.org> writes:
> Not to discount any of your suggestions, but isn't the better
> performance of gettimeofday() (and perhaps clock_gettime() also)
> in Linux because they have access to the time in userland and
> can implement it without a system call?  I seem to recall this
> being mentioned before, I could be wrong...

Please don't bring this up again.  Search the archives instead.  There
are very good reasons why this was solved the way it was in FreeBSD.
Executive summary:

 a) gettimeofday() *is* a system call in Linux.
 b) gettimeofday() is slow in FreeBSD because it is correct.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no