system clock going backward
Jay Cliburn
jacliburn at bellsouth.net
Tue Sep 19 00:32:24 UTC 2006
Jay Cliburn wrote:
> Ali Sobhi wrote:
>> Folks,
>> I'm facing a strange situation on my systems running FC5 and my
>> research has resulted in some information which I'm not about.
>> I've to mention that this problem showed up with FC5 and was not there
>> when FC4 was running.
>>
>> The system clock is misbehaving and sometimes goes backward. No ntpd
>> running (read on)
> [snip]
>> where should I go from here?
>> should I disable "acpid"?
>> should I use "pmtmr_good" boot parameter?
>> should I disable power management functions of the BIOS? (this is
>> desktop model)
>> which log file to look at to figure out what is going on?
>
> I picked up a surplus IBM Net Vista 8308 last week (ICH4/82801DB
> chipset), and lo and behold, I saw the same clock weirdness you
> reported. There's a smattering of similar reports on the web spread
> across all distros. The best description of the issue is in the source
> code itself. Take a look at the file arch/i386/kernel/timers/timer_pm.c.
>
> It seems to keep time okay if I boot with noapic, but I'm trying a
> different option at the moment: clock=tsc. I'll let you know if it
> works out.
It's been about 24 hours now; long enough to say that booting with clock=tsc
results in proper timekeeping on the system.
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