Date: Tue, 8 Apr 2014 21:29:29 +0700 From: Alexey Dokuchaev <danfe@nsu.ru> To: John Baldwin <john@baldwin.cx> Cc: freebsd-ppc@freebsd.org Subject: Re: System clock falls behind quickly on Mac mini G4 Message-ID: <20140408142929.GC39088@regency.nsu.ru> In-Reply-To: <201404071704.58659.john@baldwin.cx> References: <20140328071714.GA45961@regency.nsu.ru> <20140404144753.GA58190@regency.nsu.ru> <CAHSQbTCOoYw3PcdqmBki0-Bv4cYcxAaXWT6Dx7OF0=XzaWoQ1g@mail.gmail.com> <201404071704.58659.john@baldwin.cx>
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On Mon, Apr 07, 2014 at 05:04:58PM -0400, John Baldwin wrote: > Also, if the frequency is calibrated incorrectly during boot for some reason, > your time-of-day clock will drift constantly. I've seen this on x86 boxes Yes, I remember a thread (x86ish) some time ago about bogus TSC calibration, but... > where the TSC was calibrated incorrectly due to an interaction with SMM > interrupts for legacy USB emulation. In that case, adjusting machdep.tsc_freq > to match the frequency from the CPU's brand string "fixed" the drift. ... sysctl -a does not show machdep.tsc_freq for me on this G4 box for some reason (GENERIC kernel). ./danfe
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