Date: Wed, 2 May 2007 23:48:38 +1000 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Martin Dieringer <martin.dieringer@gmx.de> Cc: freebsd-stable@freebsd.org Subject: Re: clock too slow - big time offset with ntpdate Message-ID: <Pine.BSF.3.96.1070502225058.14146A-100000@gaia.nimnet.asn.au> In-Reply-To: <20070502140536.K860@thinkpad.dieringer.dyndns.org>
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On Wed, 2 May 2007, Martin Dieringer wrote: [chomping, ccs too] > >> > >>> I get about half a second time offsets after 10 seconds, and more > >> > >>> than 100s after half an hour or so. > >> > >>> I think it has to do with powerd, if I kill that, the time stays > >> correct. > >> > >>> It happens both on a Compaq nc4000 and an IBM ThinkPad T42p laptop. > >> > > Another effect of the problem seems to be the intermittent sound > >> > > output. Playback is ok when powerd is killed. > >> > > When changing freq by sysctl, I still get hickups in sound, so this > >> > > would be no solution. > >> > > >> > the hiccups have reappeared, so they are not related to powerd. > >> > > >> > I still have 0.5 seconds time offsets after 10 minutes, on the > >> > thinkpad, without powerd... > >> I'm wondering if this might have to do with power_profile's settings of > >> hw.acpi.cpu.cx_lowest when moving from AC to battery power? > > > > I don't have these values, are they ACPI? > > I switched off ACPI on both machines, but I use APM. Ah, silly me, yes assuming ACPI. powerd doesn't run on my Compaq 1500c 5.5-STABLE on APM, providing no dev.cpu.0.freq or dev.cpu.0.freq_levels (though its APM BIOS provides working selectable half-speed on battery) > Might this have to do with it? > Now I got following while playing sound on the Compaq: > > kernel: calcru: runtime went backwards from 183711700 usec to 183167434 usec for pid 12 (swi4: clock sio) > > here I have a working clock, but also intermittent sound output http://www.freebsd.org/doc/en/books/faq/book.html#CALCRU-NEGATIVE and http://lists.freebsd.org/pipermail/freebsd-stable/ searching for 'calcru: runtime went backwards' provides many hits, as does google; seems it could be a number of things, perhaps choice of timecounter. Out of my depth, Ian
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