Red Hat Bugzilla – Bug 429643
Dell Poweredge 2600 System Clock Jumps Forward
Last modified: 2009-01-09 00:49:58 EST
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Description of problem:
On a Dell Poweredge 2600 every 30 seconds or so the time jumps forward 5 minutes. Restarting ntpd corrects the time, but it leaps forward again never-the-less. The hardware clock remains correct.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. start ntp - clock corrects itself
2. wait approx 30 sec - clock jumps forward 5 minutes
3. goto 2.
Time jumps ahead faster
Time stays correct
I can't find a workaround.
What is the value of
[root@www ]#cat /sys/devices/system/clocksource/clocksource0/current_clocksource
Can you see if another clocksource helps? Two likely candidates are acpi_pm and
jiffies. To see what's available on your particular hardware, cat
/sys/devices/system/clocksource/clocksource0/available_clocksource and change
the value of current_clocksource to one of those. This will not persist across
a reboot, so if one of them fixes the problem for you, add clocksource=<what you
chose> to the kernel command line arguments in /boot/grub/grub.conf
The only clocksource that should be tried on an SMP system is "acpi_pm". (The
code to check for valid clocksources is missing in 2.6.23 and the system will
try to use sources that it shouldn't it the administrator asks for them.)
I changed the clocksource in grub.conf and rebooted.
[root@www ]# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
Time is now spot on. Many thanks.
Will I have to add the kernel command to the grub.conf every time there is a new
New kernel installs will copy GRUB options from the previous one.
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