Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2:hang in atomic copy)

From: Antonino A. Daplas
Date: Wed Apr 25 2007 - 21:25:42 EST

On Wed, 2007-04-25 at 21:25 +0200, Adrian Bunk wrote:
> On Wed, Apr 25, 2007 at 11:50:45AM -0700, Linus Torvalds wrote:
> >
> >
> > On Wed, 25 Apr 2007, Adrian Bunk wrote:
> > >
> > > 3W for the complete system? In CPU state S1? [1]
> >
> > In STR, 3W is quite realistic. The CPU is off, all (or most - up to you)
> > the devices are off, but the motherboard and memory is powered.
> As far as I understand it, the CPU isn't off in S1.
> > > And even 3W would still be a waste of energy.

It is, especially if you're living in a place where power infrastructure
is unreliable (such as where I live). Currently, because of the summer
heat, power demand exceeds power supply so we experience practically
daily rotating 4-hour power interruption.

That 3W saved multiplied by the total number of computers is a lot.
In this perspective, S2D (or shutdown) is preferred over S2RAM.


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