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Date: Wed, 9 Nov 2005 00:09:31 -0800
From: John-Mark Gurney <gurney_j@resnet.uoregon.edu>
To: Lev Serebryakov <lev@FreeBSD.org>
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Cc: freebsd-stable@FreeBSD.org
Subject: Re: 6.0 on VMWare 5.0: `calcru: negative runtime of -12728437 usec
	for pid 28 (irq17: lnc0)'
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Lev Serebryakov wrote this message on Wed, Nov 09, 2005 at 10:53 +0300:
> Hello freebsd-stable,
> 
>   FreeBSD 6.0 on VMWare 5.0 prints such messages every 3-4 minute.
>   Also, messages like
> 
> calcru: runtime went backwards from 40644816 to 40005944 usec for pid 3 (g_up)
> 
>   is shown routinely.
> 
>   timecounter is ACPI-safe, kernel is GENERIC one.
> 
>   5.4-STABLE on some virtual machine runs without such messages.
> 
>   And, hey, numbers are TOOOOOO big to be true, aren't they?

A coworker saw this recently (on 4.x iirc)... and a quick fix was:
sysctl kern.timecounter.hardware=i8259

Though I don't know if there is a better fix for it though...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."