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From: "Emile Coetzee" <freebsd-stable@clarotech.co.za>
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References: <001101c76707$6e796530$7efaa8c0@clarotech.co.za>
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Date: Thu, 15 Mar 2007 17:03:36 +0200
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Subject: RE: Openvpn tap uses 99% cpu time
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>Still no diagnostic info I'm afraid. What is needed is for the problem 
to be reproduced, with the openvpn process which is spinning under 
ktrace. You might need to hack your script to do this i.e. run openvpn 
directly from ktrace. Let it run for a bit, let it spin, then kill it. 
Check that you have kdump output from the openvpn process itself.

Use the -T switch of kdump to get absolute timestamps, watch the 
wallclock time on your system when the spin happens, and post an excerpt 
of the kdump output at that time, which should tell us where openvpn is 
spinning.<

Okay I finally have a ktrace of the offending process. You can view it here:
http://www.clarotech.co.za/dump/openvpn2.txt

Regards
Emile