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Time falls behind in Hardware(host) node [message #36077] Tue, 19 May 2009 21:46 Go to next message
swapneel is currently offline  swapneel
Messages: 8
Registered: November 2007
Junior Member
Hey Guys,

We are seeing a peculiar issue with one of our hardware node(host), the time keeps falling behind. We have NTP running in the server syncing time with time.nist.gov
The command below shows the lag in time after and before syncing it using rdate.

[root@myserver ~]# date ; rdate -s rdate.cpanel.net ; date
Tue May 19 13:54:35 PDT 2009
Tue May 19 14:21:28 PDT 2009


There are no relevant messages in the messages log. The kernel running in the host node is 2.6.18-92.1.18.el5.028stab060.8ent

Has anyone come across this issue ? We've had the manufacturer of the server look into this issue but they haven't found out anything else.

Any input will be much appreciated. Thanks !

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Re: Time falls behind in Hardware(host) node [message #36081 is a reply to message #36077] Wed, 20 May 2009 11:44 Go to previous messageGo to next message
maratrus is currently offline  maratrus
Messages: 1495
Registered: August 2007
Location: Moscow
Senior Member
Hi,

could you please tell us how long it takes your system to fall behind the actual time in a half of hour?

When did you issue the provided command? Just after the boot?

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Re: Time falls behind in Hardware(host) node [message #36085 is a reply to message #36081] Wed, 20 May 2009 16:47 Go to previous messageGo to next message
swapneel is currently offline  swapneel
Messages: 8
Registered: November 2007
Junior Member
> could you please tell us how long it takes your system to fall behind the actual time in a half of hour?
It's subjective and time lags by 5-10 minutes in 30 minutes time frame.


> When did you issue the provided command? Just after the boot?

The server has been online for 8 days now. The command is being executed every now and then to determine the lag in time in the server.

As of now,
Quote:


[root@myserver ~]# date ; rdate -s rdate.cpanel.net ; date
Wed May 20 09:15:05 PDT 2009
Wed May 20 09:42:43 PDT 2009

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Re: Time falls behind in Hardware(host) node [message #36151 is a reply to message #36085] Mon, 25 May 2009 07:39 Go to previous messageGo to next message
maratrus is currently offline  maratrus
Messages: 1495
Registered: August 2007
Location: Moscow
Senior Member
Could show the output of

# cat /sys/devices/system/clocksource/clocksource0/available_clocksource
# cat /sys/devices/system/clocksource/clocksource0/current_clocksource

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Re: Time falls behind in Hardware(host) node [message #36152 is a reply to message #36151] Mon, 25 May 2009 08:00 Go to previous messageGo to next message
swapneel is currently offline  swapneel
Messages: 8
Registered: November 2007
Junior Member
Here is the output,


[root@myserver ~]# cat /sys/devices/system/clocksource/clocksource0
/available_clocksource
acpi_pm jiffies hpet tsc 



[root@myserver ~]#  cat /sys/devices/system/clocksource/clocksource0/current_clocksource
tsc

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Re: Time falls behind in Hardware(host) node [message #36153 is a reply to message #36152] Mon, 25 May 2009 08:05 Go to previous messageGo to next message
maratrus is currently offline  maratrus
Messages: 1495
Registered: August 2007
Location: Moscow
Senior Member
Please, try another clocksources, e.g. acpi_pm

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Re: Time falls behind in Hardware(host) node [message #36156 is a reply to message #36153] Mon, 25 May 2009 15:56 Go to previous messageGo to next message
swapneel is currently offline  swapneel
Messages: 8
Registered: November 2007
Junior Member
Hey maratus,

How do we go about using a different clocksource ?

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Re: Time falls behind in Hardware(host) node [message #36160 is a reply to message #36156] Tue, 26 May 2009 04:34 Go to previous message
maratrus is currently offline  maratrus
Messages: 1495
Registered: August 2007
Location: Moscow
Senior Member
Hi,

I don't quite understand you.
Are you asking about the way making acpi_pm be a current clocksourse?

# echo "acpi_pm" > /sys/devices/system/clocksource/clocksource0/current_clocksource

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