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Message from discussion SOLVED: Time Clock Stops in FreeBSD 9.0 guest running under ESXi 5.0
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Adam Strohl  
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 More options Aug 3 2012, 3:38 am
Newsgroups: mailing.freebsd.stable
From: adams-free...@ateamsystems.com (Adam Strohl)
Date: Fri, 03 Aug 2012 14:38:44 +0700
Local: Fri, Aug 3 2012 3:38 am
Subject: Re: SOLVED: Time Clock Stops in FreeBSD 9.0 guest running under ESXi 5.0
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Just a heads up on the original issue, which is FreeBSD's timer/clock
stopping under ESXi 5.0 and some later versions of VMware Workstation.

I've gotten a few direct messages that this thread ranks high on Google
but people are missing the solution.  A few months ago I found this
forum posting (I believe this was linked in this thread already)
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/stable/2012-03/msg002...

The long and short of it is that changing the kern.timecounter sysctl
value to ACPI-fast or (ACPI-safe if you're not running 9.x yet) fixes
the hanging issue so far for us.

To temporarily enable it under 9.x:
sysctl kern.timecounter.hardware=ACPI-fast

Pre 9.x (which doesn't have the ACPI-fast mode):
sysctl kern.timecounter.hardware=ACPI-safe

To make this persist across reboots and be enabled by default add this
line to your /etc/sysctl.conf

Under 9.x:
kern.timecounter.hardware=ACPI-fast

Pre 9.x:
kern.timecounter.hardware=ACPI-safe

Hope this helps anyone running across this issue.

--
Adam Strohl
http://www.ateamsystems.com/

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