Messages in this thread | | | Date | Sat, 12 Sep 2009 12:39:39 +0100 | From | Matthew Garrett <> | Subject | Re: PATCH] cpuidle: A new variant of the menu governor to boost IO performance |
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On Sat, Sep 12, 2009 at 05:26:47AM +0200, Arjan van de Ven wrote: > On Fri, 11 Sep 2009 23:03:09 +0100 > Matthew Garrett <mjg59@srcf.ucam.org> wrote: > > > When you say that a bit more power was used, is that instantaneous > > power draw or total power consumption over the run of the benchmark? > > I'd have expected that completing it 50% faster and then going idle > > would be a win overall. > > I meant power, not total energy :-) > > in terms of energy it's a win if you only do a fixed amount of work...
Ok, so not really a downside. Not entirely relatedly, we've also seen io throughput issues related to P-states - using ondemand, we get reduced throughput until the number of clients becomes high enough to push the system into a higher P state. Is this something you've been able to measure?
-- Matthew Garrett | mjg59@srcf.ucam.org
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