PERFMON with Athlon breaks ata.

[Joseph Koshy]

jk>AFAIR, "PERFMON" only supports Pentium and Pentium Pro CPUs.

sh> Yeah, wasn't sure... I know the Athlon has a performance
sh> counter, but wasn't sure if it was supported etc.  Assumed
sh> not, but just thought I'd mention it in case it's supposed to
sh> work.

The Athlon's performance counters are supported by the
hwpmc(4) driver in FreeBSD 6.x.  See pmcstat(8) for a simple
command-line tool and libpmc(3) for an API to use them.

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