From owner-freebsd-current Sat Oct 21 01:50:20 1995 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id BAA19680 for current-outgoing; Sat, 21 Oct 1995 01:50:20 -0700 Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.freebsd.org (8.6.12/8.6.6) with ESMTP id BAA19653 for ; Sat, 21 Oct 1995 01:50:12 -0700 Received: from sax.sax.de by irz301.inf.tu-dresden.de (8.6.12/8.6.12-s1) with ESMTP id JAA20005 for ; Sat, 21 Oct 1995 09:50:02 +0100 Received: by sax.sax.de (8.6.11/8.6.12-s1) with UUCP id JAA14263 for freebsd-current@FreeBSD.org; Sat, 21 Oct 1995 09:50:02 +0100 Received: (from j@localhost) by uriah.heep.sax.de (8.6.12/8.6.9) id IAA15335 for freebsd-current@FreeBSD.org; Sat, 21 Oct 1995 08:47:28 +0100 From: J Wunsch Message-Id: <199510210747.IAA15335@uriah.heep.sax.de> Subject: Re: clock running faster? To: freebsd-current@FreeBSD.org Date: Sat, 21 Oct 1995 08:47:28 +0100 (MET) Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199510210623.QAA07072@godzilla.zeta.org.au> from "Bruce Evans" at Oct 21, 95 04:23:57 pm X-Phone: +49-351-2012 669 X-Mailer: ELM [version 2.4 PL23] MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Content-Length: 551 Sender: owner-current@FreeBSD.org Precedence: bulk As Bruce Evans wrote: > > The problem is that the 8254 clock takes about 5 usec to read (at least on > 8MHz ISA buses) while the Pentium clock takes only about 7 cycles to read. > The 8254 clock could be used as a reference to recalibrate the Pentium > clock fairly often, but this would take more programming and be slower. What about people who are playing with their "Turbo" key? :-] -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)