Quoting Luigi Rizzo <ri...@iet.unipi.it> (from Wed, 21 Mar 2012
18:37:28 +0100):
I guess that the credit for power saving goes mostly to the CPU
architects. Powerd only gives second-order savings, and C1 vs. C3
is ineffective, at least for HZ=1000
CPU Power (watts)
freq idle 16 threads
-----------------------
200 48 51
2200 52 83
3200 54 115
3401 56 118
powerd 48 118
I hope you all don't use a cheap PSU, but a _good_ high efficient one,
which really draws less power when idle instead of generating heat.
Some PSUs are only efficient in a sweet spot, instead of being
efficient over a broad range, even when being idle. See
http://en.wikipedia.org/wiki/80_PLUS for a quick and not so in-deep
overview (and the reality may differ from manufacturer to manufacturer).
Bye,
Alexander.
--
That does not compute.
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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