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From: Bruce Cran <bruce@cran.org.uk>
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Date: Sat, 30 Oct 2010 21:49:50 +0100
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Cc: David Rhodus <sdrhodus@gmail.com>, current@freebsd.org
Subject: Re: calcru: runtime went backwards
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On Saturday 30 October 2010 20:19:04 David Rhodus wrote:
> I haven't seen much of this since 5.x days.  Anyone else see calcru
> messages lately ?
> 
> -DR
> 
> NFS# uname -a
> FreeBSD NFS.Lesmilde.com 9.0-CURRENT FreeBSD 9.0-CURRENT #2: Fri Oct
> 29 01:07:40 CDT 2010
> root@NFS.Lesmilde.com:/usr/obj/usr/src/sys/GENERIC  amd64
> NFS# tail -25 /var/log/messages
> Oct 30 19:13:25 NFS kernel: calcru: runtime went backwards from 91464
> usec to 40935 usec for pid 2709 (csh)

It seems to occur if certain CPU power features are enabled in the BIOS - EIST 
or C1E?
I also saw it today when I connected to the virtual VGA console on my Xen VPS.

-- 
Bruce Cran