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

[Brian Wheeler]

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.
>
> _______________________________________________
> rhelv6-list mailing list
> rhelv6-list at redhat.com
> https://www.redhat.com/mailman/listinfo/rhelv6-list