From owner-freebsd-performance@FreeBSD.ORG  Wed Sep 21 01:27:34 2011
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From: Adrian Chadd <adrian@freebsd.org>
To: Anton Yuzhaninov <citrin@citrin.ru>
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Subject: Re: hwpmc overflow
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Is this an AMD class CPU?

The way the counters work on some platforms is that they count _up_ to
an overflow value, trigger the overflow interrupt, and PMC then is
supposed to calculate what the original value was.
It sounds like maybe that isn't working correctly for a certain class
of counters?



Adrian