powerd and increase in energy need

Brandon Gooch jamesbrandongooch at gmail.com
Tue Mar 20 23:47:24 UTC 2012


On Tue, Mar 20, 2012 at 3:41 PM, Matthias Gamsjager
<mgamsjager at gmail.com> wrote:
> Hi,
>
> my zfs nas has an Asus p5e motherboard (x38 chip) and an intel q9300 (quad
> core 2,5Ghz) processor with all the energy save setting enabled in the
> bios. Today I connected the power cord to a voltcraft energy meter to see
> how much energy the whole system needs in idle mode.
>
> I found out that with powerd running the cpu get clocked down to 499 mhz
> with is nice. The funny thing is that this doesn't decrease the amount of
> watts the machine need. 2,5ghz or 499mhz doen't matter at all. It gets even
> funnier. With powerd running the systems actually needs 4 watts more then
> without powerd running.
>
> Isn't the whole point of powerd to to decease the energy needs of a
> machine? or is it utterly broken with this cpu generation?

You probably want to check out the following article on the FreeBSD wiki:

http://wiki.freebsd.org/TuningPowerConsumption

The low-power states should be available to you after following the
configuration guide.

-Brandon


More information about the freebsd-stable mailing list