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

From: Adrian Bunk
Date: Wed Apr 25 2007 - 14:39:46 EST

On Wed, Apr 25, 2007 at 07:34:05PM +0200, Pavel Machek wrote:
> Hi!
> > > Even I am running in-kernel swsusp, but my managers were pretty clear
> > > they want graphical progress bar hiding all the 'ugly' swsusp
> > > messages... and in the end the same uswsusp enables compression, too.
> > >
> > > > I absolutely detest all suspend-to-disk crap. Quite frankly, I hate the
> > > > whole thing. I think they've _all_ caused problems for the "true" suspend
> > > > (suspend-to-ram), and the last thing I want to see is three or four
> > >
> > > Well, it is a bit more complex than that.
> > >
> > > suspend-to-disk is a workaround for
> > >
> > > 'suspend-to-ram eats too much power' (plus some details like
> > > being able to replace battery).
> > >...
> >
> > Why does everyone think suspend-to-disk was a laptop-only thing?
> >
> > My personal usage of suspend-to-disk is for turning the computer off in
> > the evening and getting the complete FVWM with all programs running,
> > open browser tabs,... back the next morning.
> Ok ok ok, suspend-to-disk has some other uses, too.
> But ... you are really using suspend-to-disk as a workaround for "my
> desktop takes too much power when idle". Imagine pressing "lock
> screensaver" combination, and your machine going to low power mode
> (3W?), immediately. (Quiet, too; you can't generate much noise for
> 3W). In the morning, you'd just press any key, machine would power up,
> immediately... ok, you'd have to ifconfig eth0 down, so that spurious
> packets on the local net would wake your machine, with all its fans
> etc.

3W for the complete system? In CPU state S1? [1]
And even 3W would still be a waste of energy.

And what would be the advantage? The socket my computer is connected at
is located below my bed so I can turn the power on while still lying in
bed (the computer is not reachable from my bed). OK, I could create an
external power button for the computer using longer cables connected to
the motherboard, but I still haven't understood why this should be
better for my use case than suspend-to-disk.

> Pavel


[1] unless I'm misunderstanding [2], page 9, that's the highest state
my processor supports


"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed

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