On Mon, 16 Nov 2009 03:26:19 +0900 Tejun Heo <tj@xxxxxxxxxx> wrote: > Arjan van de Ven wrote: > > On Mon, 16 Nov 2009 03:06:32 +0900 > > Tejun Heo <tj@xxxxxxxxxx> wrote: > > > >> There's DIPM. > > > > where in the code is this? > > In ata_dev_set_dipm()? > > > And just to be clear: DIPM is done by the hardware so that it needs > > sampling/etc features, rather than just straightforward (free) > > software accounting when you do software controller transitions ? > > Enabling DIPM means that the drive will be in charge of transitioning > the link into powersave modes, so if sampling SStatus is necessary to > determine how much time the link spends in powersave mode. do we get a link interrupt when the state changes? (with ALPM we do.. optionally.. which is where the flag comes in) -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
