System clock running too fast

System clock running too fast

[Michael Buesch]

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Hi,

I've got the problem with my server, that the system-clock
is running really fast. It's running over one second too
fast in one hour (aproximately).

The CPU of this machine is underclocked.
It's a Pentium-1 133Mhz running at 75Mhz. All other hardware
is running in its specifications. Can underclocking the CPU
make the clock running faster? (I never saw a clock running
slower on overclocked CPUs. 8-) )

root@server:~> uname -r
2.4.26-grsec

root@server:~> cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 5
model           : 2
model name      : Pentium 75 - 200
stepping        : 12
cpu MHz         : 75.172
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : yes
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr mce cx8
bogomips        : 149.91

- -- 
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]

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Re: System clock running too fast

[Petri Kaukasoina]

On Tue, May 25, 2004 at 07:39:45PM +0200, Michael Buesch wrote:
> I've got the problem with my server, that the system-clock
> is running really fast. It's running over one second too
> fast in one hour (aproximately).

Try tickadj (comes with ntpd):
  tickadj 9997

Re: System clock running too fast

[Felipe Alfaro Solana]

On Tue, 2004-05-25 at 19:39, Michael Buesch wrote:
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> 
> Hi,
> 
> I've got the problem with my server, that the system-clock
> is running really fast. It's running over one second too
> fast in one hour (aproximately).

Have you tried enabling CONFIG_HPET_TIMER *or* CONFIG_X86_PM_TIMER to
see if it helps? They support high accuracy timers.

Re: System clock running too fast

[Michael Buesch]

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On Tuesday 25 May 2004 20:45, you wrote:
> Have you tried enabling CONFIG_HPET_TIMER *or* CONFIG_X86_PM_TIMER to
> see if it helps? They support high accuracy timers.

Do they need special hardware support, that may be
unavailable in such an old machine? You remember it's
a Pentium 1 Socket 7 With EDO Ram.
If not, I will try the options on my next planned kernel-update.

- -- 
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]

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Re: System clock running too fast

[Felipe Alfaro Solana]

On Tue, 2004-05-25 at 20:49, Michael Buesch wrote:
> On Tuesday 25 May 2004 20:45, you wrote:
> > Have you tried enabling CONFIG_HPET_TIMER *or* CONFIG_X86_PM_TIMER to
> > see if it helps? They support high accuracy timers.
> 
> Do they need special hardware support, that may be
> unavailable in such an old machine? You remember it's
> a Pentium 1 Socket 7 With EDO Ram.
> If not, I will try the options on my next planned kernel-update.

Oops... I didn't notice the Pentium I stuff. This discards
CONFIG_HPET_TIMER and will probably leave the CONFIG_X86_PM_TIMER out
as, AFAIK, it depends on ACPI. I don't know if your machine does have a
working ACPI implementation, even more if it will be able to support
CONFIG_X86_PM_TIMER. So, I must confess my total ignorance on such an
old hardware. Anyone?

Re: System clock running too fast

[Benoît Dejean]

Le mar, 25/05/2004 à 19:39 +0200, Michael Buesch a écrit :
> Hi,
> 
> I've got the problem with my server, that the system-clock
> is running really fast. It's running over one second too
> fast in one hour (aproximately).

you should adjust it with adjtimex (there's a debian package)

-- 
Benoît Dejean
JID: TazForEver@jabber.org
http://gdesklets.gnomedesktop.org
http://www.paulla.asso.fr

Re: System clock running too fast

[Richard B. Johnson]

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On Tue, 25 May 2004, [ISO-8859-1] Benoît Dejean wrote:

> Le mar, 25/05/2004 à 19:39 +0200, Michael Buesch a écrit :
> > Hi,
> >
> > I've got the problem with my server, that the system-clock
> > is running really fast. It's running over one second too
> > fast in one hour (aproximately).
>
> you should adjust it with adjtimex (there's a debian package)
>

Ahahh.. Did you accidentally set CONFIG_MELAN in .config? That would
do about 1 second fast per hour. If not, then do: echo "">/etc/adjtime
(used to be you could delete it), now I think you
need to truncate it. Sometimes this file gets corrupt and
it takes many settings of stime to undue the corrupt-ness.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips).
            Note 96.31% of all statistics are fiction.

Re: System clock running too fast

[Michael Buesch]

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On Tuesday 25 May 2004 22:25, Richard B. Johnson wrote:
> Ahahh.. Did you accidentally set CONFIG_MELAN in .config? That would

mb@server:~/kernel> cat .config |grep MELAN
# CONFIG_MELAN is not set

> do about 1 second fast per hour. If not, then do: echo "">/etc/adjtime
> (used to be you could delete it), now I think you
> need to truncate it. Sometimes this file gets corrupt and
> it takes many settings of stime to undue the corrupt-ness.

Done. Let's see if it works.

- -- 
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]

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Re: System clock running too fast

[Benoît Dejean]

Le mar, 25/05/2004 à 16:25 -0400, Richard B. Johnson a écrit : 
> On Tue, 25 May 2004, [ISO-8859-1] Benot Dejean wrote:
> 
> > Le mar, 25/05/2004 à 19:39 +0200, Michael Buesch a écrit :
> > > Hi,
> > >
> > > I've got the problem with my server, that the system-clock
> > > is running really fast. It's running over one second too
> > > fast in one hour (aproximately).
> >
> > you should adjust it with adjtimex (there's a debian package)
> >
> 
> Ahahh.. Did you accidentally set CONFIG_MELAN in .config? That would
> do about 1 second fast per hour. If not, then do: echo "">/etc/adjtime
> (used to be you could delete it), now I think you
> need to truncate it. Sometimes this file gets corrupt and
> it takes many settings of stime to undue the corrupt-ness.

no

cat /etc/adjtime
-0.541692 1084270031 0.000000
1084270031
LOCAL

before, my /etc/adjtime was empty, i was loosing 4.36s / 24H
i sync my clock every 15days, and the difference is always < 0.1s (-0.04
average)
so i'm pretty happy with it

-- 
Benoît Dejean
JID: TazForEver@jabber.org
http://gdesklets.gnomedesktop.org
http://www.paulla.asso.fr

Re: System clock running too fast

[john stultz]

On Tue, 2004-05-25 at 10:39, Michael Buesch wrote:
> I've got the problem with my server, that the system-clock
> is running really fast. It's running over one second too
> fast in one hour (aproximately).
> 
> The CPU of this machine is underclocked.
> It's a Pentium-1 133Mhz running at 75Mhz. All other hardware
> is running in its specifications. Can underclocking the CPU
> make the clock running faster? (I never saw a clock running
> slower on overclocked CPUs. 8-) )

Try setting up ntpd to correct for your system's drift (1sec/hour ~=
277ppm drift).

thanks
-john