The clock is running too fast

[Dan MacMillan]

Hola

I'm sorry, I don't know what 'ntc' is.  Do you mean 'ntp'?  You can use ntp
or not ... if your timing hardware is off, ntp will constantly try to slew
the time back to where it should be, which will a) mean your systems concept
of time is very non-linear and b) fill the log with warning messages.  It's
actually a good check to see if the timer's good (although an slmost equally
good check is to sit there and look at the clock).

I forgot to mention that besides changing /etc/sysctl.conf, you have to
reboot.  If you don't want to reboot, you will have to do "sysctl
kern.timecounter.hardware=i8254" at a prompt.  But I'm not sure if that's a
value that can be set after the system boots.

I suggested "i8254" because it's the only device that was supplying good
time values on my system.  If you have trouble with that device, you might
also want to try "TSC".

-Dan

-----Original Message-----
From: owner-freebsd-questions at freebsd.org
[mailto:owner-freebsd-questions at freebsd.org]On Behalf Of Stephen Liu
Sent: March 19, 2004 01:12
To: questions at freebsd.org
Subject: Re: The clock is running too fast


Hi Dan,

Thanks for your advice.

> I had a similar problem on one of the machines at work.  Here is a memo I
> made to myself to remind me of how to fix the problem in the future:
>
> The "ACPI-safe" Timecounter does not work (it is way, WAY too fast).  To
> get around this, add the following line to /etc/sysctl.conf:
>
> kern.timecounter.hardware=i8254

Added above line to /etc/sysctl.conf

$ cat /etc/sysctl.conf
vfs.usermount=1
kern.timecounter.hardware=i8254

Now only 2 lines in this file.

I have adjusted the clock thereafter and will check it again later

> There are multiple pieces of hardware capable of supplying timing
> information to the OS.  "dmesg | grep Timecounter" should give you a list
> of all such devices.
>
> I think this is an ACPI-related problem, since that is the technology I
> understand the least at the moment.

$ dmesg | grep Timecounter
Timecounter "i8254" frequency 1193182 Hz quality 0
Timecounter "ACPI-safe" frequency 3579545 Hz quality 1000
Timecounter "TSC" frequency 350797051 Hz quality 800
Timecounters tick every 10.000 msec

Shall I run 'ntc' to synchronize the clock.

B.R.
Stephen



> -----Original Message-----
> From: owner-freebsd-questions at freebsd.org
> [mailto:owner-freebsd-questions at freebsd.org]On Behalf Of Stephen Liu
> Sent: March 18, 2004 21:47
> To: questions at freebsd.org
> Subject: The clock is running too fast
>
>
> Hi folks,
>
> AMD CUP
> FreeBSD 5.2
>
> The clock on KDE desktop is running on double speed compelling me to
adjust
> it
> periodically.  Kindly advise how to fix this problem.
>
> TIA
>
> B.R.
> Stephen Liu

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