Date: Thu, 04 Feb 1999 22:53:16 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Adam David <adam@veda.is> 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 Message-ID: <684.918165196@critter.freebsd.dk> In-Reply-To: Your message of "Thu, 04 Feb 1999 20:23:17 GMT." <199902042023.UAA16145@veda.is>
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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
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