From owner-freebsd-current Fri Feb 27 22:28:10 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id WAA28767 for freebsd-current-outgoing; Fri, 27 Feb 1998 22:28:10 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from zibbi.mikom.csir.co.za (zibbi.mikom.csir.co.za [146.64.24.58]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id WAA28761 for ; Fri, 27 Feb 1998 22:28:04 -0800 (PST) (envelope-from jhay@zibbi.mikom.csir.co.za) Received: (from jhay@localhost) by zibbi.mikom.csir.co.za (8.8.8/8.8.7) id IAA05667; Sat, 28 Feb 1998 08:27:42 +0200 (SAT) From: John Hay Message-Id: <199802280627.IAA05667@zibbi.mikom.csir.co.za> Subject: Re: I586_CALIBRATION ?? In-Reply-To: <19980227232116.35376@vmunix.com> from Mark Mayo at "Feb 27, 98 11:21:16 pm" To: mark@vmunix.com (Mark Mayo) Date: Sat, 28 Feb 1998 08:27:42 +0200 (SAT) Cc: current@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL32 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Hi, just curious where CLK_USE_I586_CALIBRATION went ?? > > I used to use in my PPro, but not config (and LINT) tell me > it's no longer an option. With the I586_CALIBRATION the boot > message would correctly detect the CPU speed each and every > time. Now it's off by +/- 15%, and my clock has gained over > an hour in under a day.. :-( > > What should I be using here?? I have the > CLK_USE_I8254_CALIBRATION option in the kernel right now. Maybe I > should have nothing "extra" in there? It is now called CLK_USE_TSC_CALIBRATION :-) It is being used on Pentium and better processors except SMP machines. 486 and below and SMP machines use the I8254 variation. You can define both in a kernel config file and the system will figure out which to use. Defining CLK_USE_TSC_CALIBRATION made a huge difference on my machine's clock here. Well that is my understanding... John -- John Hay -- John.Hay@mikom.csir.co.za To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message