From owner-cvs-all Thu Feb 6 14:48:16 2003 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 8D88237B401; Thu, 6 Feb 2003 14:48:13 -0800 (PST) Received: from freebie.xs4all.nl (freebie.xs4all.nl [213.84.32.253]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6802543FB1; Thu, 6 Feb 2003 14:48:12 -0800 (PST) (envelope-from wkb@freebie.xs4all.nl) Received: from freebie.xs4all.nl (localhost [127.0.0.1]) by freebie.xs4all.nl (8.12.6/8.12.6) with ESMTP id h16MmBMw025008; Thu, 6 Feb 2003 23:48:11 +0100 (CET) (envelope-from wkb@freebie.xs4all.nl) Received: (from wkb@localhost) by freebie.xs4all.nl (8.12.6/8.12.6/Submit) id h16MmAPT025007; Thu, 6 Feb 2003 23:48:10 +0100 (CET) Date: Thu, 6 Feb 2003 23:48:10 +0100 From: Wilko Bulte To: phk@FreeBSD.ORG Cc: Peter Wemm , Bruce Evans , "Greg 'groggy' Lehey" , all-committers@FreeBSD.ORG, legacy-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/i386/include clock.h src/sys/i386/i386 tsc.c Message-ID: <20030206234810.A24990@freebie.xs4all.nl> References: <20030206220209.EDA882A89E@canning.wemm.org> <2855.1044569083@critter.freebsd.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <2855.1044569083@critter.freebsd.dk>; from phk@FreeBSD.ORG on Thu, Feb 06, 2003 at 11:04:43PM +0100 X-OS: FreeBSD 4.7-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Thu, Feb 06, 2003 at 11:04:43PM +0100, phk@FreeBSD.ORG wrote: > In message <20030206220209.EDA882A89E@canning.wemm.org>, Peter Wemm writes: > >phk@freebsd.org wrote: > >> In message <20030206174018.R72201-100000@gamplex.bde.org>, Bruce Evans writes > > : > >> > >> >However, precise measurements of these clocks turn out to be essentially > >> >useless except probably for phk's nonstandard hardware, since the > >> >accuracy of these clocks is much worse than their precision. Drift of > >> >10-100 parts per million for a 10 degree temperature change is normal. > >> >So calibrations more precise than this are not useful. > >> > >> Actually, things have improved, and motherboard crystals are now > >> generally no worse than +/-1 PPM/K. > > > >For newer motherboards. :-) > > I think for anything after PII, it was the new clock regime which > put tighter limits on jitter that did it I think. Time to make it +/- 1 PHK/K ? :-) -- | / o / /_ _ wilko@FreeBSD.org |/|/ / / /( (_) Bulte To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message