Date: Sun, 29 Jul 2001 22:49:10 -0700 From: Mike Smith <msmith@freebsd.org> To: Bruce Evans <bde@zeta.org.au> Cc: Daniel Rock <D.Rock@t-online.de>, current@FreeBSD.ORG Subject: Re: ACPI: Clock problems in -current Message-ID: <200107300549.f6U5nAr02533@mass.dis.org> In-Reply-To: Your message of "Sun, 29 Jul 2001 17:20:27 %2B1000." <Pine.BSF.4.21.0107291708130.1077-100000@besplex.bde.org>
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> On Sat, 28 Jul 2001, Mike Smith wrote:
>
> > You could also try building a kernel with CLK_CALIBRATION_LOOP defined
> > and then booting with -v (without the timer disabled). This might be
> > instructive (I don't know for certain that it'll calibrate the ACPI
> > timer, since it may not have been probed yet).
>
> It won't. CLK_CALIBRATION_LOOP only iterates calibration of the i8254
> and TSC timers relative to the RTC. None of the clock calibration stuff
> is very useful. All the clock frequencies depend on the temperature,
> so their values at boot time are only slightly more related to their
> values at run time than their values at a random time. Average values
> are probably better than boot time values.
Understsood, however the current problem reports indicate an off-by-2x
problem, which the calibration loops would deal with just fine.
Unfortunately, I can't reproduce the problem here - the new timer seems
to be working just fine. Can anyone seeing this please let me know:
- What power management hardware your system has: look at the output of
pciconf -lv for a "power management controller", eg:
none0@pci0:7:3: class=0x068000 card=0x00000000 chip=0x71138086 rev=0x03 hdr=0x00 vendor = 'Intel Corporation'
device = '82371AB PIIX4 Power Management Controller'
class = bridge
subclass = PCI-unknown
- which timecounter is in use on your system, eg:
mass# sysctl kern.timecounter.hardware
kern.timecounter.hardware: ACPI
- whether you are seeing any "*time went backwards" console messages.
Thanks.
Mike
--
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