Messages in this thread | | | Date | Tue, 28 Feb 2006 22:34:28 +0100 | From | Dominik Brodowski <> | Subject | Re: Status of X86_P4_CLOCKMOD? |
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On Tue, Feb 28, 2006 at 03:26:32PM -0600, Matt Mackall wrote: > > So even if the battery lasts longer, you don't have anything of it, 'cause > > the CPU can even compute _less_ in this longer time-span. Remember that > > idling doesn't count... > > Which is different from other power-saving modes how? If it means I > can read my email longer on the plane, it's a power-saving mode.
But you can't... [*]
> > > In short, power usage and heat production are _the same thing_. > > > > Yes and no. The heat production is more levelled if you use throttling, so > > the temperature achieved is lesser, which might cause fans not having to > > start or air conditioning having less work to do. > > The time scale for heat propagation is enough slower than throttling > that I'd expect this difference to amount to approximately nil.
For short-term load spikes, yes. If your server has a task which takes up one hour at full time, and the temp reaches 45° C then, but you have nothing else for it to do overnight, then it does might sense to throttle it to 50%, which will mean two hours, but only 40° C.
Dominik
[*] unless the idling algorithm is broken and does not enter C2-type idle states. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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