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Date: Fri, 07 Jul 2006 15:44:03 -0500
From: Stephen Montgomery-Smith <stephen@math.missouri.edu>
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To: Mike Jakubik <mikej@rogers.com>
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Cc: stable@freebsd.org, freebsd-current@freebsd.org, obrien@freebsd.org,
	John Baldwin <jhb@freebsd.org>
Subject: Re: Still getting 'calcru: runtime went backwards'
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Mike Jakubik wrote:
> John Baldwin wrote:
> 
>> That is partly because when you run top it queries the resource usage 
>> of the various processes via fill_kinfo_proc().  When you don't run 
>> top, no one is asking for the resource usage numbers, so the kernel 
>> doesn't waste time calculating them.
>>
>>   
> 
> 
> Right, also running ps has the same effect. But why do these messages 
> occur?
> 
>> In both cases your errors are for a long-running kernel process that's 
>> been up since boot.  What's the uptime on your box?
>>
>>   
> 
> 
> Not sure what the uptime was, this box is not in production yet so i 
> shut it off regularly. I would guess under an hour.

I used to be able to get these predictably on FreeBSD 5, except then it 
could actually cause a panic.  If you run "top -s 0" (as root) you can 
get these errors arriving at a spectacular rate.