Speed Step and powerd for servers status?
Abdullah Ibn Hamad Al-Marri
wearabnet at yahoo.ca
Fri Mar 21 07:52:21 PDT 2008
----- Original Message ----
> From: Maxim Sobolev <sobomax at FreeBSD.org>
> To: Abdullah Ibn Hamad Al-Marri <wearabnet at yahoo.ca>
> Cc: FreeBSD Current <current at FreeBSD.org>
> Sent: Tuesday, March 18, 2008 10:49:29 PM
> Subject: Re: Speed Step and powerd for servers status?
> Abdullah Ibn Hamad Al-Marri wrote:
> > Hey,
> > I would like to use powerd and speed step for my servers, and make sure it
> will use the MAX CPU if needed then go to idle mode to save the power.
> > Any recommendation?
> It's questionable whether or not it will have positive effect on the server:
> The combination of processor-frequency scaling and idle-power states
> provides a somewhat surprising result. On almost all modern hardware, if
> there is code to run, then it is more power efficient to run the
> processor at full speed. This "race to idle" concept stems from the
> power consumption of an idle processor being much lower than an active
> processor, even if running at a lower speed. The overall power
> consumption will be less if the processor spends a short time at full
> speed and then falls back to idle, rather than spending twice as long
> being active at a lower frequency.
> Full text is here:
Did you try it with mysql bench or ubench?
-Abdullah Ibn Hamad Al-Marri
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