From owner-cvs-all@FreeBSD.ORG  Tue Nov 29 07:08:05 2005
Return-Path: <owner-cvs-all@FreeBSD.ORG>
X-Original-To: cvs-all@FreeBSD.org
Delivered-To: cvs-all@FreeBSD.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id CE18F16A41F;
	Tue, 29 Nov 2005 07:08:05 +0000 (GMT) (envelope-from imp@bsdimp.com)
Received: from harmony.bsdimp.com (vc4-2-0-87.dsl.netrack.net [199.45.160.85])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E526843D7D;
	Tue, 29 Nov 2005 07:07:58 +0000 (GMT) (envelope-from imp@bsdimp.com)
Received: from localhost (localhost.village.org [127.0.0.1] (may be forged))
	by harmony.bsdimp.com (8.13.3/8.13.3) with ESMTP id jAT77liq018454;
	Tue, 29 Nov 2005 00:07:48 -0700 (MST) (envelope-from imp@bsdimp.com)
Date: Tue, 29 Nov 2005 00:08:16 -0700 (MST)
Message-Id: <20051129.000816.28766059.imp@bsdimp.com>
To: bde@zeta.org.au
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <20051129145321.E33975@delplex.bde.org>
References: <20051128002937.T17822@epsplex.bde.org> <86d5kkbygy.fsf@xps.des.no>
	<20051129145321.E33975@delplex.bde.org>
X-Mailer: Mew version 3.3 on Emacs 21.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0
	(harmony.bsdimp.com [127.0.0.1]);
	Tue, 29 Nov 2005 00:07:49 -0700 (MST)
Cc: des@des.no, src-committers@FreeBSD.org, rwatson@FreeBSD.org,
	cvs-all@FreeBSD.org, cvs-src@FreeBSD.org
Subject: Re: cvs commit: src/sys/sys time.h src/sys/kern kern_time.c
X-BeenThere: cvs-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the entire tree <cvs-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-all>
List-Post: <mailto:cvs-all@freebsd.org>
List-Help: <mailto:cvs-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 29 Nov 2005 07:08:05 -0000

In message: <20051129145321.E33975@delplex.bde.org>
            Bruce Evans <bde@zeta.org.au> writes:
: Even with this, applications would still need to know when select() was
: called to recover the time when it returned.  Adding deltas from select()
: to a previous timestamp wouldn't work very well the relative error in
: the deltas is large for small deltas (unless you pessimize select() to
: get a precise timestamp).

Not to mention the fact that scheduling delays can add somewhat to the
errors here...  although on modern, fast systems this is likely less
of a concern.

Warner