Date: Fri, 11 May 2007 17:23:05 +0100 From: Tom Evans <tevans.uk@googlemail.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-stable@FreeBSD.ORG, martin.dieringer@gmx.de Subject: Re: clock problem Message-ID: <1178900585.1231.63.camel@zoot.mintel.co.uk> 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>
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--=-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 <martin.dieringer@gmx.de> 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--
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