From owner-cvs-all Thu Feb 4 13:55:59 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id NAA27738 for cvs-all-outgoing; Thu, 4 Feb 1999 13:55:59 -0800 (PST) (envelope-from owner-cvs-all@FreeBSD.ORG) Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.40.131]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id NAA27699; Thu, 4 Feb 1999 13:55:33 -0800 (PST) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.9.1/8.8.5) with ESMTP id WAA00686; Thu, 4 Feb 1999 22:53:25 +0100 (CET) To: Adam David cc: nate@mt.sri.com (Nate Williams), adam@FreeBSD.ORG, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/i386/conf GENERIC In-reply-to: Your message of "Thu, 04 Feb 1999 20:23:17 GMT." <199902042023.UAA16145@veda.is> Date: Thu, 04 Feb 1999 22:53:16 +0100 Message-ID: <684.918165196@critter.freebsd.dk> From: Poul-Henning Kamp Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk In message <199902042023.UAA16145@veda.is>, Adam David writes: >> > Modified files: >> > sys/i386/conf GENERIC >> > Log: >> > remind that apm is required in order for timekeeping to work >> >> Huh? > >Including apm in the kernel build fixes the problem where on (some?) Pentium >class CPUs the timekeeping gets hosed because there is something weird >happening with the TSC that makes it unusable for keeping time. > >The problem manifests as some of the system time counting being too slow by a >factor of 32. Of course it never occurred to me that removing apm from the >kernel (since it's not a laptop) would have this undesirable side effect. >Therefore I place a warning notice so others won't fall into the same trap. This should be backed out, the correct fix for these systems is to sysctl -w kern.timecounter.method=1 -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message