[rhelv6-list] CPU utilization issue following leap second insertion

David Coulson david at davidcoulson.net
Sun Jul 1 02:26:50 UTC 2012


Yeah, I'm rebooting a couple of non-production systems now. 
Unfortunately, we're right in the middle of our busy part of the day, so 
rebooting production isn't a great option.

Did you have any RHEL6 systems not log the 'inserting leap second' 
entry? I've got ~20% of my boxes not logging, and not having the issue - 
They are older systems which were installed as RHEL6.0, and other boxes 
are RHEL6.1 and patched current.

On 6/30/12 10:18 PM, Brian Wheeler wrote:
> Yes, some of my machines are going crazy.  I've found that rebooting 
> them seems to work around it...
>
> Brian
>
>
> On 06/30/2012 10:17 PM, David Coulson wrote:
>> Most of my RHEL6 systems running Java applications went nuts when the 
>> leap second was added:
>>
>> [root at rhtsutility02 stuff]# ssh rhesdevwesb01 grep UTC /var/log/messages
>> Jun 30 19:59:59 rhesdevwesb01 kernel: Clock: inserting leap second 
>> 23:59:60 UTC
>>
>> Output of sar during interval in question
>> 07:59:01 PM     all      0.12      0.00      0.20      0.00 0.00     
>> 99.68
>> 08:00:07 PM     all      8.18      0.02      4.14      0.00 0.00     
>> 87.66
>> 08:01:07 PM     all     70.08      0.00     29.92      0.00 0.00      
>> 0.00
>> 08:02:07 PM     all     69.49      0.00     30.51      0.00 0.00      
>> 0.00
>> 08:03:07 PM     all     69.61      0.00     30.39      0.00 0.00      
>> 0.00
>> 08:04:07 PM     all     69.76      0.00     30.24      0.00 0.00      
>> 0.00
>>
>> I've RHEL4 and RHEL5 systems running the same apps, same JVM, same 
>> J2EE (mostly WebSphere), and they were all fine.
>>
>> A couple of my RHEL6 boxes didn't log the 'inserting leap second' 
>> dmesg entry, and they did not exhibit an issue - Not sure why they 
>> did not log it, since they are all using the same NTP clock sources.
>>
>> Anyone else see this? I'm going to grab a bunch of sosreports and get 
>> a case open, but wanted to see if it was something unique to my 
>> environment.
>>
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>
>
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