Dan, is that machine equipped with Hyperthreading?

Attilio

Yes. It's an Intel Atom 330, which is a dualcore CPU with HT (4 cores
visible in "top" as a result)

Yes, mine is also Atom 330.

I cannot test the patch because my machine is also in production now. But I have tested it with hyperthreading.
powerd with HyperThreading -> spin lock hold too long
powerd without HyperThreading -> no problem
no powerd with/without HyperThreading -> no problem

This blog article also describe the same situation:
http://hype-o-thetic.com/2009/07/09/freenas-d945gclf2-configuration/


By the way, I found that the readings of coretemp don't significant change when I enabled powerd so that I doubt that powerd may not be very useful for Atom CPU?

Thanks very much,
C.C.
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