From owner-freebsd-stable@FreeBSD.ORG Fri May 11 16:23:08 2007 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id BD47916A403 for ; Fri, 11 May 2007 16:23:08 +0000 (UTC) (envelope-from tevans.uk@googlemail.com) Received: from py-out-1112.google.com (py-out-1112.google.com [64.233.166.183]) by mx1.freebsd.org (Postfix) with ESMTP id 6DF8113C458 for ; Fri, 11 May 2007 16:23:08 +0000 (UTC) (envelope-from tevans.uk@googlemail.com) Received: by py-out-1112.google.com with SMTP id f31so810983pyh for ; Fri, 11 May 2007 09:23:07 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=googlemail.com; s=beta; h=domainkey-signature:received:received:subject:from:to:cc:in-reply-to:references:content-type:date:message-id:mime-version:x-mailer; b=PG+oeFHKEnq00Cwmxj6aWaBgpHKVKAUC2lX/ftrc/IpO00wucL37rlZ5dpTR56B1v7MAjaoY/PI3jieaoT6XvjI1zaE4HdRAfrpJZ/qeaOF7xK8ocmUSYMrV+UlQBNG7Jyp86YGJi1zNPGUw4uubP5TIii+8PShcovnwRbPlIuU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=beta; h=received:subject:from:to:cc:in-reply-to:references:content-type:date:message-id:mime-version:x-mailer; b=s79brwc7OcV97Tbh9XIrfhOKPtoRz4/sX5GbYKOUcLNZviJJ2myPr9NWTEyHz1/HJbjZ3XvMckx2fDs/64TOXWH6hqUw6/PoReezRB2pjeEqPwfGlwlLXedJEeC090Mhwa3dRAalT5eAJGeL2kDHpo7WShRtAA/0QiF0iAenvE4= Received: by 10.64.210.3 with SMTP id i3mr148250qbg.1178900587270; Fri, 11 May 2007 09:23:07 -0700 (PDT) Received: from ?IPv6:::ffff:127.0.0.1? ( [217.206.187.79]) by mx.google.com with ESMTP id e17sm10013659qbe.2007.05.11.09.23.06; Fri, 11 May 2007 09:23:06 -0700 (PDT) From: Tom Evans To: "M. Warner Losh" In-Reply-To: <20070511.085325.-1889956816.imp@bsdimp.com> References: <20070508164234.L839@thinkpad.dieringer.dyndns.org> <20070510.225237.1159134316.imp@bsdimp.com> <20070511110759.L700@thinkpad.dieringer.dyndns.org> <20070511.085325.-1889956816.imp@bsdimp.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-IRvL7ycDQvCFpJbukgPf" Date: Fri, 11 May 2007 17:23:05 +0100 Message-Id: <1178900585.1231.63.camel@zoot.mintel.co.uk> Mime-Version: 1.0 X-Mailer: Evolution 2.10.0 FreeBSD GNOME Team Port Cc: freebsd-stable@FreeBSD.ORG, martin.dieringer@gmx.de Subject: Re: clock problem X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 May 2007 16:23:08 -0000 --=-IRvL7ycDQvCFpJbukgPf Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Fri, 2007-05-11 at 08:53 -0600, M. Warner Losh wrote: > In message: <20070511110759.L700@thinkpad.dieringer.dyndns.org> > Martin Dieringer writes: > : This is NOT a hardware problem. 1. I have this on 2 machines, 2. the > : problem is solved by switching to ACPI instead of APM >=20 > It is a hardware problem. APM + powerd changes the frequency of the > TSC. If the TSC is used as the time source, then you'll get bad > timekeeping. ACPI uses its own frequency source that is much more > stable and independent of the TSC, so switching to it fixes the > problem because you are switching the hardware from using a really bad > frequency source with ugly steps to using a good frequency source w/o > steps. >=20 > Warner Surely that would imply that it is a software misconfiguration issue. If the TSC is unreliable under fairly standard duties, and there exists an alternate source that is reliable, surely that indicates the manufacturer has identified a problem, and solved it with alternate hardware. The failure then to use the correct hardware is a software misconfiguration. Cheers Tom --=-IRvL7ycDQvCFpJbukgPf Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQBGRJhjlcRvFfyds/cRAvrZAKCV8NFptyp8uF2Lv+ZdwfUuLFXMsQCeMNER dTVyg0/n1qs2KhRKLZm5Cb8= =cnn/ -----END PGP SIGNATURE----- --=-IRvL7ycDQvCFpJbukgPf--