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



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 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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