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Brendan Gregg and colleagues at Netflix have found a way to get the real effective core clock rate from EC2 instances, which generally don't make the usual cpu performance counters available to virtualized guests.
This is a fantastic way to manage bhyve virtual machines running under FreeBSD. OpenBSD now works quite well and bsd.rd can run fine in FreeBSD 10.1-BETA1 and later. Prior to 10.1, bsd.rd from OpenBSD would not run.