heater mode was a coin termed by sandia around 2000. They had 10,000 CPUs,
2 per board, and they had one cpu spin on network activity while the other
computed.

Spinning made it warm: heater mode.

So  I noticed last night that my T420, running one core as an AC, was
getting warm.

This is not supposed to happen. The monitor/mwait in NIX is supposed to
mean the core is largely idle.

If somebody wants to check out our use of monitor/mwait, and see what might
be wrong, there's a little project for you.

thanks

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