Date: Sat, 5 Jul 2008 17:57:43 +1000 (EST) From: Bruce Evans <brde@optusnet.com.au> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: freebsd-acpi@freebsd.org Subject: Re: HP/Compaq nx6325 clock "jumping around" Message-ID: <20080705175001.C7509@besplex.bde.org> In-Reply-To: <20080705000712.GF29380@server.vk2pj.dyndns.org> References: <20080702191827.GK1469@uriah.heep.sax.de> <20080703145049.S6189@delplex.bde.org> <20080705000712.GF29380@server.vk2pj.dyndns.org>
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On Sat, 5 Jul 2008, Peter Jeremy wrote: > On 2008-Jul-03 15:55:28 +1000, Bruce Evans <brde@optusnet.com.au> wrote: >> - pressing the lid switch to turn the screen off makes the time jump by >> almost precisely 1 second using any timecounter. The system appears >> to spend the 1 second in something like SMM mode with all interrupts >> and all timecounters stopped. More precisely, the jump is: >> ACPI-fast and TSC: -1.000000 +- 10 uS >> i8254: -1.043000 +- 1 mS > > My nx6125 with F.11 BIOS does something very similar but only in VTY > mode - I don't see the time jump when running X (and I haven't tried > measuring the jump to that accuracy). Sometimes I see a time jump > when switching between VTY and X. Other than that, ntpd is quite > happy with ACPI-fast. You mentioned this a while ago. I just tested it (again?). The 1 second jump was still there in X mode (old X). There seemed to be a jump starting X the first time, but not for restarts. The 1 second jump sometimes caused "calcru: runtime went backwards" messages. I use "ntpdate -q <ntp-server>" in a loop to measure jumps accurately (if they are isolated). (This is more accurate than ntptrace.) Bruce
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