From owner-cvs-all Mon Sep 20 1:13:17 1999 Delivered-To: cvs-all@freebsd.org Received: from dingo.cdrom.com (castles524.castles.com [208.214.165.88]) by hub.freebsd.org (Postfix) with ESMTP id A6DD914CFF; Mon, 20 Sep 1999 01:13:11 -0700 (PDT) (envelope-from mike@dingo.cdrom.com) Received: from dingo.cdrom.com (localhost [127.0.0.1]) by dingo.cdrom.com (8.9.3/8.8.8) with ESMTP id BAA29815; Mon, 20 Sep 1999 01:05:57 -0700 (PDT) (envelope-from mike@dingo.cdrom.com) Message-Id: <199909200805.BAA29815@dingo.cdrom.com> X-Mailer: exmh version 2.0.2 2/24/98 To: Poul-Henning Kamp Cc: Mike Smith , cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/conf files.i386 src/sys/i386/i386 mp_clock.c In-reply-to: Your message of "Mon, 20 Sep 1999 10:06:53 +0200." <21408.937814813@critter.freebsd.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 20 Sep 1999 01:05:57 -0700 From: Mike Smith Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk > In message <199909200752.AAA29722@dingo.cdrom.com>, Mike Smith writes: > > >> On PIIX4 based SMP systems use the PMTMR register for timecounting. > > > >You should be using this on all systems with the PIIX4, not just SMP > >systems. > > No, the TSC is far superior on UP, (unless destroyed by APM), it > has roughly 100 times better resolution and is twice as fast to > query. It is, however, as you point out, non-deterministically unreliable. I'm fairly certain that we should option out the use of the TSC by default - it is simply biting too many people for too little gain. > Once we get the ACPI stuff rolling we can use the PIIX for APM too. That would be "use the PIIX for ACPI", since we won't be using APM. -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message