Scheduled checks falling far behind

[Litwin, Matthew]

I have been chasing my tail trying to figure out why my RRD files were very sparsely populated, and I am realizing that my checks are falling behind of their scheduled times up to 3 times their set check interval. For example a service that should be checking every 5 minutes. In the example below, the time is 00:19:02, the last check was 00:10:30 and the next scheduled check time is 00:13:28. This means it is almost 6 minutes behind schedule and almost 9 minutes since the last check!

I find even if I shorten the check interval to say 3 minutes it still behaves about the same. The server has very low load and nagios is hardly working at all. (usually below 4% cpu) I haven't touch any of the tuning on this and from what I have read the default settings appear unthrottled. Is there any way to make it "work harder"?

--Service information--
Last Updated: Sat Oct 23 00:19:02 UTC 2010

--Service State Information--
Current Status:	
  OK  
 (for 7d 16h 14m 46s)
Status Information:	CPU STATISTICS OK : user=0.12% system=0.00% iowait=0.00% idle=99.88%
Performance Data:	0.12;0.00;0.00;99.88;80;90
Current Attempt:	1/3  (HARD state)
>>> Last Check Time:	10-23-2010 00:10:30  <<<<
Check Type:	ACTIVE
Check Latency / Duration:	612.633 / 2.052 seconds
>>> Next Scheduled Check:  	10-23-2010 00:13:28 <<<
Last State Change:	10-15-2010 08:04:16
Last Notification:	N/A (notification 0)
Is This Service Flapping?	
  NO  
 (0.00% state change)
In Scheduled Downtime?	
  NO  
Last Update:	10-23-2010 00:18:33  ( 0d 0h 0m 29s ago)



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