From owner-freebsd-questions@FreeBSD.ORG Fri Oct 14 19:18:11 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CDD8D16A41F for ; Fri, 14 Oct 2005 19:18:11 +0000 (GMT) (envelope-from bkoenig@cs.tu-berlin.de) Received: from efacilitas.de (smtp.efacilitas.de [85.10.196.108]) by mx1.FreeBSD.org (Postfix) with ESMTP id 38AF543D6A for ; Fri, 14 Oct 2005 19:18:08 +0000 (GMT) (envelope-from bkoenig@cs.tu-berlin.de) Received: from eurystheus.local (port-212-202-37-245.dynamic.qsc.de [212.202.37.245]) by efacilitas.de (Postfix) with ESMTP id 5B7064AFF7; Fri, 14 Oct 2005 21:25:16 +0200 (CEST) Received: from [192.168.1.2] (muhkuh.local [192.168.1.2]) by eurystheus.local (Postfix) with ESMTP id 13DBE331FF0; Fri, 14 Oct 2005 21:17:22 +0200 (CEST) Message-ID: <4350832B.5020600@cs.tu-berlin.de> Date: Fri, 14 Oct 2005 21:18:51 -0700 From: =?ISO-8859-1?Q?Bj=F6rn_K=F6nig?= User-Agent: Mozilla Thunderbird 1.0.7 (Windows/20050923) X-Accept-Language: de-DE, de, en-us, en To: Peter B References: <200510141611.j9EGBCg2008762@brother.ludd.ltu.se> In-Reply-To: <200510141611.j9EGBCg2008762@brother.ludd.ltu.se> Content-Transfer-Encoding: 7bit MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-questions@freebsd.org Subject: Re: TSC Timer "Quality" ? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Oct 2005 19:18:11 -0000 Peter B schrieb: Intel pentium cpu timer tsc: 'Timecounter "TSC" frequency X Hz quality Y' (from dmesg) What is the definition of "quality" ..? I have looked briefly in the /usr/src/sys/i386/i386/tsc.c sourcefile and the intel-celeron datasheet. Without finding anything useful. From src/sys/sys/timetc.h: 54 int tc_quality; 55 /* 56 * Used to determine if this timecounter is better than 57 * another timecounter higher means better. Negative 58 * means "only use at explicit request". 59 */ As far as I understand this, it is used internally only. Regards Björn