Date: Wed, 27 Nov 2019 01:17:50 +0100 From: Per Hedeland <per@hedeland.org> To: freebsd-arm@freebsd.org Subject: Re: rpi3 clock drift Message-ID: <925e99c9-d723-0209-5533-edf8cb7cc6c1@hedeland.org> In-Reply-To: <A9CDA147-01A1-4A5B-8270-9F986847EA64@kronometrix.org> References: <MWHPR06MB3134CD05551D36CC3B45D368AA450@MWHPR06MB3134.namprd06.prod.outlook.com> <c5942861c2aa0929239e59a000ce76407f4fd191.camel@freebsd.org> <MWHPR06MB31341D8CB3BBF98153B55A74AA450@MWHPR06MB3134.namprd06.prod.outlook.com> <486c0bc46deeefb8338f50fe6dfdf7951786e56c.camel@freebsd.org> <A9CDA147-01A1-4A5B-8270-9F986847EA64@kronometrix.org>
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On 2019-11-27 00:17, Stefan Parvu wrote: > >> >> Can someone else with an rpi3 (which keeps good time) confirm that >> that's the usual number? > > > this is slightly different model: rpi3+ . I think it does use a different SOC than rpi3. > > krmx@k1:~ % sysctl kern.timecounter > kern.timecounter.fast_gettime: 1 > kern.timecounter.tick: 1 > kern.timecounter.choice: ARM MPCore Timecounter(1000) dummy(-1000000) > kern.timecounter.hardware: ARM MPCore Timecounter > kern.timecounter.alloweddeviation: 5 > kern.timecounter.stepwarnings: 0 > kern.timecounter.tc.ARM MPCore Timecounter.quality: 1000 > kern.timecounter.tc.ARM MPCore Timecounter.frequency: 19200000 > kern.timecounter.tc.ARM MPCore Timecounter.counter: 3645432288 > kern.timecounter.tc.ARM MPCore Timecounter.mask: 4294967295 The same on what is a 3B w/o '+' AFAIR, keeping very good time: pi3 2> sysctl kern.timecounter kern.timecounter.fast_gettime: 1 kern.timecounter.tick: 1 kern.timecounter.choice: ARM MPCore Timecounter(1000) dummy(-1000000) kern.timecounter.hardware: ARM MPCore Timecounter kern.timecounter.alloweddeviation: 5 kern.timecounter.stepwarnings: 0 kern.timecounter.tc.ARM MPCore Timecounter.quality: 1000 kern.timecounter.tc.ARM MPCore Timecounter.frequency: 19200000 kern.timecounter.tc.ARM MPCore Timecounter.counter: 27058350 kern.timecounter.tc.ARM MPCore Timecounter.mask: 4294967295 and pi3 3> cat /var/db/ntp/ntpd.drift -5.333 pi3 4> uname -a FreeBSD pi3.hedeland.org 12.0-STABLE FreeBSD 12.0-STABLE r345358 GENERIC arm64 --Per Hedeland
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