* [9fans] NIX is in heater mode
@ 2025-02-10 16:00 ron minnich
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From: ron minnich @ 2025-02-10 16:00 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
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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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