On Wed, 19 Jan 2011, Matthew Garrett wrote: > On Tue, Jan 18, 2011 at 09:52:26PM -0500, Len Brown wrote: > > + * Disable HW auto demotion on tick-less idle kernels > > + */ > > +static unsigned int has_nhm_snb_hw_auto_demotion; > > +#ifdef CONFIG_NO_HZ > > +static unsigned int auto_demotion; > > +#else > > +static unsigned int auto_demotion = 1; > > +#endif > > What if someone boots with nohz=off? The next version of this patch will disable auto-demotion independent of HZ, on the assumption that the governor is smart enough today to get what it asks for, HZ or NO_HZ. It is also now limits the change to NHM/WSM, as SNB has auto-un-demotion to address this scenario. > Just so I'm clear on this - this is unrelated to the auto-popup on DMA, > right? Right, C2 popup is a different feature, and that is smart enought to return to the power saving state after the DMA is done. cheers, Len Brown, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
