hwpmc overflow

Adrian Chadd adrian at freebsd.org
Wed Sep 21 01:27:34 UTC 2011

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?


More information about the freebsd-performance mailing list