Date: Tue, 8 Apr 2014 22:02:29 +0700 From: Alexey Dokuchaev <danfe@nsu.ru> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-ppc@freebsd.org Subject: Re: System clock falls behind quickly on Mac mini G4 Message-ID: <20140408150229.GA46702@regency.nsu.ru> In-Reply-To: <201404081041.44272.jhb@freebsd.org> References: <20140328071714.GA45961@regency.nsu.ru> <201404071704.58659.john@baldwin.cx> <20140408142929.GC39088@regency.nsu.ru> <201404081041.44272.jhb@freebsd.org>
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On Tue, Apr 08, 2014 at 10:41:44AM -0400, John Baldwin wrote: > It wouldn't be tsc_freq on a powerpc box. You'd need to see what your > timecounter is and what frequency it is using (kern.timecounter nodes) > and see if that is adjustable. Yup, sorry; I forgot that our TSC maps to actual x86 Time Stamp Counter, not being some aggregated MI relatively high-precision time keeping thing. Does not look I can do much about it though: $ sysctl kern.timecounter kern.timecounter.fast_gettime: 1 kern.timecounter.tick: 2 kern.timecounter.choice: timebase(0) dummy(-1000000) kern.timecounter.hardware: timebase kern.timecounter.alloweddeviation: 5 kern.timecounter.stepwarnings: 0 kern.timecounter.tc.timebase.mask: 4294967295 kern.timecounter.tc.timebase.counter: 3224483187 kern.timecounter.tc.timebase.frequency: 41620907 kern.timecounter.tc.timebase.quality: 0 ./danfe
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